Concepts & Examples ScreenOS Reference Guide

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1 Concepts & Examples ScreenOS Reference Guide Voice-over-Internet Protocol Release 6.3.0, Rev. 02 Published: Revision 02

2 Juniper Networks, Inc North Mathilda Avenue Sunnyvale, California USA Juniper Networks, Junos, Steel-Belted Radius, NetScreen, and ScreenOS are registered trademarks of Juniper Networks, Inc. in the United States and other countries. JunosE is a trademark of Juniper Networks, Inc. All other trademarks, service marks, registered trademarks, or registered service marks are the property of their respective owners. Juniper Networks assumes no responsibility for any inaccuracies in this document. Juniper Networks reserves the right to change, modify, transfer, or otherwise revise this publication without notice. Products made or sold by Juniper Networks or components thereof might be covered by one or more of the following patents that are owned by or licensed to Juniper Networks: U.S. Patent Nos. 5,473,599, 5,905,725, 5,909,440, 6,192,051, 6,333,650, 6,359,479, 6,406,312, 6,429,706, 6,459,579, 6,493,347, 6,538,518, 6,538,899, 6,552,918, 6,567,902, 6,578,186, and 6,590,785. Copyright 2009, Juniper Networks, Inc. All rights reserved. Revision History December 2012 Revision 02 Content subject to change. The information in this document is current as of the date listed in the revision history. SOFTWARE LICENSE The terms and conditions for using this software are described in the software license contained in the acknowledgment to your purchase order or, to the extent applicable, to any reseller agreement or end-user purchase agreement executed between you and Juniper Networks. By using this software, you indicate that you understand and agree to be bound by those terms and conditions. Generally speaking, the software license restricts the manner in which you are permitted to use the software and may contain prohibitions against certain uses. The software license may state conditions under which the license is automatically terminated. You should consult the license for further details. For complete product documentation, please see the Juniper Networks Website at END USER LICENSE AGREEMENT The Juniper Networks product that is the subject of this technical documentation consists of (or is intended for use with) Juniper Networks software. Use of such software is subject to the terms and conditions of the End User License Agreement ( EULA ) posted at By downloading, installing or using such software, you agree to the terms and conditions of that EULA. ii

3 Abbreviated Table of Contents About This Guide xiii Part 1 VOIP Chapter 1 H.323 Application Layer Gateway Chapter 2 Session Initiation Protocol Application Layer Gateway Chapter 3 Media Gateway Control Protocol Application Layer Gateway Chapter 4 Skinny Client Control Protocol Application Layer Gateway Chapter 5 Apple ichat Application Layer Gateway Part 2 Index Index iii

4 Voice-over-Internet Protocol iv

5 Table of Contents About This Guide xiii Document Conventions xiii Document Feedback xvi Requesting Technical Support xvi Part 1 VOIP Chapter 1 H.323 Application Layer Gateway Overview Alternate Gatekeeper Examples Example: Gatekeeper in the Trust Zone WebUI CLI Example: Gatekeeper in the Untrust Zone WebUI CLI Example: Outgoing Calls with NAT WebUI CLI Example: Incoming Calls with NAT WebUI CLI Example: Gatekeeper in the Untrust Zone with NAT WebUI CLI Chapter 2 Session Initiation Protocol Application Layer Gateway Overview SIP Request Methods Classes of SIP Responses SIP Application Layer Gateway Session Description Protocol Sessions Pinhole Creation Session Inactivity Timeout SIP Attack Protection Example: SIP Protect Deny Example: Signaling-Inactivity and Media-Inactivity Timeouts Example: UDP Flooding Protection v

6 Voice-over-Internet Protocol Example: SIP Connection Maximum SIP with Network Address Translation Outgoing Calls Incoming Calls Forwarded Calls Call Termination Call Re-INVITE Messages Call Session Timers Call Cancellation Forking SIP Messages SIP Headers SIP Body SIP NAT Scenario Examples Incoming SIP Call Support Using the SIP Registrar Example: Incoming Call (Interface DIP) Example: Incoming Call (DIP Pool) Example: Incoming Call with MIP Example: Proxy in the Private Zone Example: Proxy in the Public Zone Example: Three-Zone, Proxy in the DMZ Example: Untrust Intrazone Example: Trust Intrazone Example: Full-Mesh VPN for SIP Bandwidth Management for VoIP Services Chapter 3 Media Gateway Control Protocol Application Layer Gateway Overview MGCP Security About MGCP Entities in MGCP Endpoint Connection Call Call Agent Commands Response Codes Examples Media Gateway in Subscribers Homes Call Agent at the ISP WebUI CLI ISP-Hosted Service WebUI CLI Chapter 4 Skinny Client Control Protocol Application Layer Gateway Overview SCCP Security vi

7 Table of Contents About SCCP SCCP Components SCCP Client Call Manager Cluster SCCP Transactions Client Initialization Client Registration Call Setup Media Setup SCCP Control Messages and RTP Flow SCCP Messages Examples Example: Call Manager/TFTP Server in the Trust Zone WebUI CLI Example: Call Manager/TFTP Server in the Untrust Zone WebUI CLI Example: Three-Zone, Call Manager/TFTP Server in the DMZ WebUI CLI Example: Intrazone, Call Manager/TFTP Server in Trust Zone WebUI CLI Example: Intrazone, Call Manager/TFTP Server in Untrust Zone WebUI CLI Example: Full-Mesh VPN for SCCP WebUI (for Central) CLI (for Central) WebUI (for Branch Office 1) CLI (for Branch Office 1) WebUI (for Branch Office 2) CLI (for Branch Office 2) Chapter 5 Apple ichat Application Layer Gateway Overview Configuring the AppleiChat ALG WebUI CLI WebUI CLI WebUI CLI vii

8 Voice-over-Internet Protocol Configuration Examples Scenario 1: Private Public Network WebUI CLI Scenario 2: Intrazone Call Within Private Network WebUI CLI Scenario 3: Users Across Different Networks WebUI CLI Part 2 Index Index viii

9 List of Figures About This Guide xiii Figure 1: Images in Illustrations xvi Part 1 VOIP Chapter 1 H.323 Application Layer Gateway Figure 2: H.323 Protocol Figure 3: H.323 Gatekeeper in the Trust Zone Figure 4: H.323 Gatekeeper in the Untrust Zone Figure 5: Network Address Translation Outgoing Calls Figure 6: Network Address Translation Incoming Calls Figure 7: Gatekeeper in the Untrust Zone Chapter 2 Session Initiation Protocol Application Layer Gateway Figure 8: SIP ALG Call Setup Figure 9: SIP NAT Scenario Figure 10: SIP NAT Scenario Figure 11: Incoming SIP Figure 12: Incoming Call with Interface DIP on ethernet3 Interface Figure 13: Incoming Call with DIP Pool Figure 14: Incoming Call with MIP Figure 15: Proxy in the Private Zone Figure 16: Proxy in the Public Zone Figure 17: Proxy in the DMZ Figure 18: Untrust Intrazone Figure 19: Trust Intrazone Figure 20: Full-Mesh VPN for SIP Figure 21: Priority-Level Settings Chapter 3 Media Gateway Control Protocol Application Layer Gateway Figure 22: Media Gateway in Subscribers Home Figure 23: ISP-Hosted Service Chapter 4 Skinny Client Control Protocol Application Layer Gateway Figure 24: Call Setup and Teardown Figure 25: Call Manager/TFTP Server in the Private Zone Figure 26: Call Manager/TFTP Server in the Untrust Zone Figure 27: Call Manager/TFTP Server in the DMZ Figure 28: Intrazone, Call Manager/TFTP Server in Trust Zone Figure 29: Intrazone, Call Manager/TFTP Server in Trust Zone Figure 30: Full-Mesh VPN for SCCP ix

10 Voice-over-Internet Protocol Chapter 5 Apple ichat Application Layer Gateway Figure 31: AppleiChat Scenario 1 Users on Public and Private Networks Figure 32: AppleiChat Scenario 2 Intrazone Call Within a Private Network Figure 33: AppleiChat Scenario 3 Users Across Different Networks x

11 List of Tables Part 1 VOIP Chapter 2 Session Initiation Protocol Application Layer Gateway Table 1: Session Initiation Protocol Responses Table 2: Requesting Messages with NAT Chapter 3 Media Gateway Control Protocol Application Layer Gateway Table 3: MGCP Commands Chapter 4 Skinny Client Control Protocol Application Layer Gateway Table 4: SCCP Registration Messages Table 5: Station to Call Manager Messages Table 6: Call Manager to Station Messages Table 7: Call Manager 4.0 Messages and Post Skinny Table 8: Call Manager to Station Chapter 5 Apple ichat Application Layer Gateway Table 9: Standard ichat Service Ports xi

12 Voice-over-Internet Protocol xii

13 About This Guide Document Conventions VOIP focuses on the various methods available in ScreenOS to perform address translation. This guide contains the following chapters: H.323 Application Layer Gateway on page 3 describes the H.323 protocol and provides examples of typical scenarios. Session Initiation Protocol Application Layer Gateway on page 15 describes the Session Initiation Protocol (SIP) and shows how the SIP ALG processes calls in Route and Network Address Translation (NAT) modes. Examples of typical scenarios follow a summary of the SIP architecture. Media Gateway Control Protocol Application Layer Gateway on page 65 presents an overview of the Media Gateway Control Protocol (MGCP) ALG and lists the firewall security features of the implementation. Examples of typical scenarios follow a summary of the MGCP architecture. Skinny Client Control Protocol Application Layer Gateway on page 79 presents an overview of the Skinny Client Control Protocol (SCCP) ALG and lists the firewall security features of the implementation. Examples of typical scenarios follow a summary of the SCCP architecture. Apple ichat Application Layer Gateway on page 107 presents an overview of the AppleiChat ALG and lists the firewall security features of the implementation. Examples of typical scenarios follow a summary of the AppleiChat architecture. Document Conventions on page xiii Document Feedback on page xvi Requesting Technical Support on page xvi This document uses the conventions described in the following sections: Web User Interface Conventions on page xiii Command Line Interface Conventions on page xiv Naming Conventions and Character Types on page xiv Illustration Conventions on page xv Web User Interface Conventions The Web user interface (WebUI) contains a navigational path and configuration settings. To enter configuration settings, begin by clicking a menu item in the navigation tree on xiii

14 Voice-over-Internet Protocol the left side of the screen. As you proceed, your navigation path appears at the top of the screen, with each page separated by angle brackets. The following example shows the WebUI path and parameters for defining an address: Policy > Policy Elements > Addresses > List > New: Enter the following, then click OK: Address Name: addr_1 IP Address/Domain Name: IP/Netmask: (select), /32 Zone: Untrust To open Online Help for configuration settings, click the question mark (?) in the upper right of the screen. The navigation tree also provides a Help > Config Guide configuration page to help you configure security policies and Internet Protocol Security (IPSec). Select an option from the list, and follow the instructions on the page. Click the? character in the upper right for Online Help on the Config Guide. Command Line Interface Conventions The following conventions are used to present the syntax of command line interface (CLI) commands in text and examples. In text, commands are in boldface type and variables are in italic type. In examples: Variables are in italic type. Anything inside square brackets [ ] is optional. Anything inside braces { } is required. If there is more than one choice, each choice is separated by a pipe ( ). For example, the following command means set the management options for the ethernet1, the ethernet2, or the ethernet3 interface : set interface { ethernet1 ethernet2 ethernet3 } manage NOTE: When entering a keyword, you only have to type enough letters to identify the word uniquely. Typing set adm u whee j12fmt54 will enter the command set admin user wheezer j12fmt54. However, all the commands documented in this guide are presented in their entirety. Naming Conventions and Character Types ScreenOS employs the following conventions regarding the names of objects such as addresses, admin users, auth servers, IKE gateways, virtual systems, VPN tunnels, and zones defined in ScreenOS configurations: If a name string includes one or more spaces, the entire string must be enclosed within double quotes; for example: set address trust local LAN /24 xiv

15 About This Guide Any leading spaces or trailing text within a set of double quotes are trimmed; for example, local LAN becomes local LAN. Multiple consecutive spaces are treated as a single space. Name strings are case-sensitive, although many CLI keywords are case-insensitive. For example, local LAN is different from local lan. ScreenOS supports the following character types: Single-byte character sets (SBCS) and multiple-byte character sets (MBCS). Examples of SBCS are ASCII, European, and Hebrew. Examples of MBCS also referred to as double-byte character sets (DBCS) are Chinese, Korean, and Japanese. ASCII characters from 32 (0x20 in hexadecimals) to 255 (0xff), except double quotes ( ), which have special significance as an indicator of the beginning or end of a name string that includes spaces. NOTE: A console connection only supports SBCS. The WebUI supports both SBCS and MBCS, depending on the character sets that your browser supports. Illustration Conventions Figure 1 on page xvi shows the basic set of images used in illustrations throughout this volume. xv

16 Voice-over-Internet Protocol Figure 1: Images in Illustrations Document Feedback If you find any errors or omissions in this document, contact Juniper Networks at Requesting Technical Support Technical product support is available through the Juniper Networks Technical Assistance Center (JTAC). If you are a customer with an active J-Care or JNASC support contract, or are covered under warranty, and need postsales technical support, you can access our tools and resources online or open a case with JTAC. JTAC policies For a complete understanding of our JTAC procedures and policies, review the JTAC User Guide located at Product warranties For product warranty information, visit JTAC hours of operation The JTAC centers have resources available 24 hours a day, 7 days a week, 365 days a year. xvi

17 About This Guide Self-Help Online Tools and Resources For quick and easy problem resolution, Juniper Networks has designed an online self-service portal called the Customer Support Center (CSC) that provides you with the following features: Find CSC offerings Search for known bugs Find product documentation Find solutions and answer questions using our Knowledge Base Download the latest versions of software and review your release notes Search technical bulletins for relevant hardware and software notifications Join and participate in the Juniper Networks Community Forum Open a case online in the CSC Case Manager To verify service entitlement by product serial number, use our Serial Number Entitlement (SNE) Tool https://tools.juniper.net/serialnumberentitlementsearch/ Opening a Case with JTAC You can open a case with JTAC on the Web or by telephone. Use the Case Manager tool in the CSC at Call JTAC ( toll free in USA, Canada, and Mexico). For international or direct-dial options in countries without toll-free numbers, visit us at xvii

18 Voice-over-Internet Protocol xviii

19 PART 1 VOIP H.323 Application Layer Gateway on page 3 Session Initiation Protocol Application Layer Gateway on page 15 Media Gateway Control Protocol Application Layer Gateway on page 65 Skinny Client Control Protocol Application Layer Gateway on page 79 Apple ichat Application Layer Gateway on page 107 1

20 Voice-over-Internet Protocol 2

21 CHAPTER 1 H.323 Application Layer Gateway Overview This chapter describes the H.323 protocol and provides examples for configuring the H.323 Application Layer Gateway (ALG) on a Juniper Networks security device. This chapter contains the following sections: Overview on page 3 Alternate Gatekeeper on page 3 Examples on page 4 The H.323 Application Layer Gateway (ALG) allows you secure voice over IP (VoIP) communication between terminal endpoints such as IP phones and multimedia devices. In such a telephony system, gatekeeper devices manage call registration, admission, and call status for VoIP calls. Gatekeepers can reside in the two different zones or in the same zone. Figure 2: H.323 Protocol NOTE: Illustrations in this chapter use IP phones for illustrative purposes, although it is possible to make configurations for other hosts that use VoIP, such as NetMeeting multimedia devices. Alternate Gatekeeper The H.323 ALG in ScreenOS supports the use of an alternate gatekeeper. All the IP end points must register with a gatekeeper through the Registration, Admission, and Status (RAS) protocol before they can attempt calls between them. During the registration process, the primary gatekeeper sends Gatekeeper Confirm (GCF) and Registration 3

22 Voice-over-Internet Protocol Confirm (RCF) messages to the endpoint. These messages contain the list of available alternate gatekeepers. The alternate gatekeeper provides high availability, redundancy and scalability for the IP end points. If the primary gatekeeper fails, IP-enabled phones and other multimedia devices registered with that gatekeeper are registered with the alternate gatekeeper. You can configure the primary and alternate gatekeepers in the Trust, Untrust, or DMZ zones. NOTE: Currently, the Juniper Networks H.323 ALG supports the gatekeeper and the alternate gatekeeper in the same zone. To use the alternate gatekeeper feature, you need to configure a security policy that allows the endpoint device to reach the alternate gatekeeper when the endpoint cannot reach the primary gatekeeper. Examples This section contains the following configuration scenarios: Example: Gatekeeper in the Trust Zone on page 4 Example: Gatekeeper in the Untrust Zone on page 5 Example: Outgoing Calls with NAT on page 7 Example: Incoming Calls with NAT on page 9 Example: Gatekeeper in the Untrust Zone with NAT on page 12 Example: Gatekeeper in the Trust Zone In the following example, you set up two policies that allow H.323 traffic to pass between IP phone hosts and a gatekeeper in the Trust zone, and an IP phone host ( ) in the Untrust zone. In this example, the security device can be in either transparent mode or route mode. Both the Trust and Untrust security zones are in the trust-vr routing domain. Figure 3: H.323 Gatekeeper in the Trust Zone WebUI 1. Address Policy > Policy Elements > Addresses > List > New: Enter the following, then click OK: 4

23 Chapter 1: H.323 Application Layer Gateway 2. Policies Address Name: IP_Phone IP Address/Domain Name: IP/Netmask: (select), /32 Zone: Untrust Policies > (From: Trust, To: Untrust) New: Enter the following, then click OK: Source Address: Address Book Entry: (select), Any Destination Address: Address Book Entry: (select), IP_Phone Service: H.323 Policies > (From: Untrust, To: Trust) New: Enter the following, then click OK: Source Address: Address Book Entry: (select), IP_Phone Destination Address: Address Book Entry: (select), Any Service: H.323 CLI 1. Address 2. Policies set address untrust IP_Phone /32 set policy from trust to untrust any IP_Phone h.323 permit set policy from untrust to trust IP_Phone any h.323 permit save Example: Gatekeeper in the Untrust Zone Because transparent and route modes do not require address mapping of any kind, security device configuration for a gatekeeper in the Untrust zone is usually identical to the configuration for a gatekeeper in the Trust zone. In the following example, you set up two policies to allow H.323 traffic to pass between IP phone hosts in the Trust zone, and the IP phone at IP address (and the gatekeeper) in the Untrust zone. The device can be in transparent or route mode. Both the Trust and Untrust security zones are in the trust-vr routing domain. Figure 4: H.323 Gatekeeper in the Untrust Zone 5

24 Voice-over-Internet Protocol WebUI 1. Addresses Policy > Policy Elements > Addresses > List > New: Enter the following, then click OK: Address Name: IP_Phone IP Address/Domain Name: IP/Netmask: (select), /32 Zone: Untrust Policy > Policy Elements > Addresses > List > New: Enter the following, then click OK: 2. Policies Address Name: Gatekeeper IP Address/Domain Name: IP/Netmask: (select), /32 Zone: Untrust Policies > (From: Trust, To: Untrust) New: Enter the following, then click OK: Source Address: Address Book Entry: (select), Any Destination Address: Address Book Entry: (select), IP_Phone Service: H.323 Policies > (From: Untrust, To: Trust) New: Enter the following, then click OK: Source Address: Address Book Entry: (select), IP_Phone Destination Address: Address Book Entry: (select), Any Service: H.323 Policies > (From: Trust, To: Untrust) New: Enter the following, then click OK: Source Address: Address Book Entry: (select), Any Destination Address: Address Book Entry: (select), Gatekeeper Service: H.323 CLI 1. Addresses 2. Policies set address untrust IP_Phone /32 set address untrust gatekeeper /32 set policy from trust to untrust any IP_Phone h.323 permit set policy from trust to untrust any gatekeeper h.323 permit set policy from untrust to trust IP_Phone any h.323 permit 6

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