IP-PBX and VoIP Gateway for SMEs and Branch Offices. . With QoS Approach. Helder Sousa Maio, 2005

Transcription

2 What is edgebox? A multi-function network device that incorporates an IP-PBX and VoIP Gateway providing a complete and secure IP communications infrastructure for SMEs and enterprise branch offices. Unique combination of VoIP services plus security plus QoS Can be easily installed, used, and maintained by non-it experts Full replacement for traditional solutions consisting of assorted components from different vendors Best Broadband Appliance

3 Features and Benefits A complete and integrated network infrastructure with very low TCO Advantages: Simplicity, Security, Flexibility, Maintainability, Reliability 3

4 Advantages Simplicity - Quick to deploy, integrates with existing data/voice systems, wizard based setup, an all-in-one solution Security - Inbuilt network sercurity including user authentication, aurthorisation and accounting (AAA), VPNs and firewall Flexibility - Provides LAN, WAN and WiFi connectivity, supports analogue, digital and IP phones and legacy PBX systems Maintainability - Simple web-based interface, automatic software update service, automatic backup Reliability - Seemless routing of calls via IP or PSTN network if the other fails, QoS ensures consistent audio quality 4

5 What is edgebox? edgebox is a software suite that runs on commercial off-the-shelf (COTS) hardware. Various certified COTS hardware platforms for different performance requirements: 5

6 Integrated Voice and Data Full IP-PBX solution based on Asterisk Analogue and Digital PSTN gateway (FXO/FXS, BRI, PRI) Allows transparent VoIP calls to internal extensions, remote edgebox switches, ITSP or PSTN network Supports SIP and IAX Integrated QoS for voice and data enables VoIP as a reliable service Can be scaled as requirements grow by simply upgrading the COTS hardware 6

7 Fully Featured PBX Easy to use graphical interface for defining complex IVR menus ACD allowing routing of volume calls to prioritised queues Define call rules for different time periods and individual extensions Voice mail forwarding to Least Cost Routing tables Telephone Number Mapping (ENUM) for maximum IP telephony coverage Call conferencing, parking and forwarding Hunt groups and follow-me feature Sound manager for music on hold and voice messages User profiles with call permissions 7

8 Connectivity 1. Phones/faxes connect through analogue phone cards with FXS ports 2. Softphones or USB phones on laptops and WiFi phones connect through an integrated WiFi Access Point 3. PCs with softphones or USB phones connect through the LAN 4. IP Phones, or analogue phones with a suitable adaptor, connect via the LAN 5. Calls can be routed to and from ISP via an ADSL connection 6. Calls can be also routed through an existing telephone service (analogue or digital) 8

9 Outbound Routing Sophisticated call routing tables allow the lowest cost route to be pre-selected, e.g. Via the Internet to branch offices in different countries to reduce cost Via the existing telephone network for other international calls to guarantee call quality Select carrier that provides the lowest cost for the destination called Calls are connected to a specific service by dialing a prefix code that identifies the server Different routes can be defined to provide continuity when services fail 9

10 Inbound Routing ACD functions for distributing large volumes of calls: Set up voice menus with graphical IVR editor Define multiple queues from the menus and assign agents to queues Define frequency of the announce position message Define ring strategy, e.g. ring all, round robin, ring agent with fewest calls Define max number of callers waiting in a queue Assign priorities to queues Configure music on hold Create rules for different time periods, e.g. for holiday cover Direct Inward Dial (DID) 10

11 Continuity Calls made through the edgebox can be connected using any available service provider: Via an ISP over the Internet through one or more ITSPs Via the existing analogue or digital telephone networks For all calls, Telephone Number Mapping (ENUM) can be used to search for a SIP registered numbers, if no number is found, PSTN is used instead If either IP or PSTN network fails, calls are transparently routed via alternative network 11

12 Interoperable Interoperable with other devices: Supports all common IP phone and gateway protocols (SIP, IAX) and codecs (GSM, G729, G711, G726) Connects to softphones, USB phones, standard phones with ATAs, IP phones, WiFi phones Integrates with traditional PBX systems Support 1, 2, 3 or 4 port, FXS/FXO, BRI and T1/E1 PRI cards Remote extensions configurable across NAT and firewalled networks DHCP provides simple network integration 12

13 Enterprise Grade Security Stateful Inspection Firewall (WAN, EWAN, VPNs) Optional authentication at Firewall level to grant access to services and resources Policy enforcing and selective access based on user/machine/group Fully configurable and audited internet access policies to the WAN and EWAN Secure Virtual Private Network (VPN) with IPSec (3DES encryption and MD5 authentication). Secure PPTP connections 13

14 Collaboration services Http and Ftp server, proxy Web caching and content filtering server (smtp, pop, imap, web) Remote mail storage (data center) anti-virus and anti-spam File and Print server Windows primary domain controller, single-point-logon Windows File server (shares) Disk quota control Application deployment platform (LAPP Linux, Apache, PostgreSQL, PHP) 14

15 Simplified Network Deployment Web-based management Wizard-based setup reduces installation and setup time Default initial configuration One step user creation adds credentials for all services Basic business router Built-in ADSL, Cable UMTS support Built-in WiFi support Network Address Translation (NAT) Domain name server (DNS) DHCP Server 15

16 Easy Management and Reliability Web-based secure management RADIUS / LDAP accounting and authentication Reports for network and service usage Data backup and restore SNMP V1/V2, Syslog support Software-key protected Automatic Software updates Integrated failover (Q2 2006) 16

17 Solutions: IP-PBX for SMEs edgebox is a fully functional IP-PBX which provides a flexible and scalable alternative to a traditional PBX and can provide significant cost savings between offices and internationally. Integrated QoS ensures quality of voice calls Integrated security maintains the integrity of IP network Free calls between branch offices Reduced rate national and international calls via an ITSP VoIP gateway provides network redundancy between IP and PSTN networks Teleworkers provided with an office extension 17

18 Quality of Service Allows for effective VoIP prioritisation. Outbound and Inbound QoS Outbound classes (upgold, upsilver, upbronze, and upbe) Two inbound classes (downbe and downpremium). Custom QoS pipes guarantee traffic in the event of congestion. DiffServ Enables differentiated services and Service Level Agreements (SLA) Uses CBQ, RED, WFQ 18

19 QoS on edgebox Implementation plan Study the current standard spec s (RFC s, Common COTS, etc...) Stablish your requirements Must cover Core Functions (QoS in this case) but also management and monitoring and documentation and never forget the market window Define the solution for the requirements Implement Test Deploy and Support 19

20 Stablish your requirements Modelo de QoS Traffic classes Diferentiate (inbound) and (outbound). Hierarquical definition Características de largura de banda: largura de banda mínima garantida, máxima permitida e possibilidade de empréstimo de largura de banda. Políticas: prioridades (absolutas e relativas) e débito (rate-based). 20

21 Disciplinadores Considerados PQ (Priority Queueing) neste esquema, os pacotes de tráfego são inseridos em filas com diferentes prioridades. Os pacotes são retirados de uma dada fila somente quando as filas de prioridade mais elevada estiverem vazias. Dentro de cada fila, os pacotes são normalmente escalonados segundo uma ordem first-in first-out (FIFO). CBQ (Class Based Queue classful) também conhecido com WRR (Weighted Round Robin Queueing), este disciplinador permite atribuir diferentes percentagens de largura de banda a diferentes filas, ao mesmo tempo que, ao retirar de cada fila, em cada passagem do disciplinador, pelo menos um pacote, evita o estrangulamento de tráfegos menos prioritários. TBF (Token Bucket Filter) limita o tráfego a um dado débito permitindo, no entanto, pequenas rajadas de excesso de tráfego. 21

22 Disciplinadores Considerados WFQ (Weighted Fair Queueing) Este disciplinador é um modelo FQ que suporta fluxos com diferentes requisitos de largura de banda, atribuindo a cada fluxo um dado peso correspondente a uma percentagem de largura de banda do porto de saída Normalmente, a atribuição de pacotes a filas é feita através do campo TOS. Este modelo utiliza um algoritmo complexo que ultrapassa a limitação do FQ em que tráfegos com pacotes maiores têm mais largura de banda do que tráfegos com pacotes menores. Uma variação deste disciplinador é o modelo Class-Based WFQ, que faz o escalonamento de um número limitado de filas atribuídas a agregados de tráfego. SFQ (Stochastic Fairness Queueing) O tráfego é dividido num número de filas FIFO, servidas segundo uma ordem round robin. No entanto, não há uma fila por cada sessão, antes utiliza um algoritmo que divide o tráfego por um número limitado de filas. A divisão do tráfego em classes utiliza um algoritmo hashing. Embora seja possível a utilização de um único disciplinador, tal como o CBQ, é teoricamente aconselhada a utilização conjunta de alguns destes disciplinadores. Para além destes disciplinadores, é ponderada a utilização de mecanismos RED para a prevenção de congestão e de mecanismos token e leaky bucket para a realização de modelação na interface de saída. 22

23 Classification: Parameters Classification throug basic filters, and applying diffserv architecture: IP Address (origin / destiny) TCP/UDP ports Traffic flow (in/out) Protocol Access policies Period of time DSCP field (DiffServ). 23

24 Classification: Classes Outbound Premium Olimpic upgold upsilver upbronze upbe Inbound downpremium downbe 24

25 Upstream disciplines qdisc dsmark Premium qdisc cbq bounded class cbq qdisc tbf Olympic class cbq class cbq bounded class cbq Best-Effort qdisc gred qdisc wfq Gold DP1 Silver DP2 Bronze DP3 25

26 Downstream disciplines qdisc cbq Premium class cbq Best-Effort bounded class cbq class cbq bounded qdisc sfq qdisc sfq 26

27 QoS: Practice Let s just try something for real 27

28 Solutions Some solutions that can be effectively built with edgebox: IP-PBX for SMEs Contact Centres SME Instant Office WiFi Hot-Spots 28

29 Solutions: IP-PBX for SMEs edgebox is a fully functional IP-PBX which provides a flexible and scalable alternative to a traditional PBX and can provide significant cost savings between offices and internationally. Integrated QoS ensures quality of voice calls Integrated security maintains the integrity of IP network Free calls between branch offices Reduced rate national and international calls via an ITSP VoIP gateway provides network redundancy between IP and PSTN networks Teleworkers provided with an office extension 29

30 Solutions: Contact Centres edgebox is an ideal solution for small and medium sized Contact Centres dealing with inbound and outbound calls especially for greenfield sites or those with inadequate network infrastructure IVR for intelligent routing of calls to the appropriate attendant and providing self-service transactions ACD for effective management of large call volumes Least Cost Routing enabling the use of IP telephony (via ITSPs) to reduce the cost of outbound calls Easily link-in off-site teleworker agents Call quality is ensured due to edgebox providing a full networking infrastructure 30

31 Solutions: SME Instant Office edgebox is deployed in SMEs to provide a complete networking and communications infrastructure enabling staff to securely access IP telephony services, the internet and as well as sharing and backing up files. 31

32 Solutions: Wireless Hot Spot Working with partners to develop a HotSpot in a Box for hotels, cafes, conference centres, airports, etc. Local Radius Server provides pre-paid, anonymous access Remote server provides access for account customers Provides access to IP telephony for mobile users A walled garden provides info, local services promotion, entertainment, etc., to be integrated with existing systems such as hotel management billing system 32

33 European Headquarters Critical Links, S.A. Parque Industrial de Taveiro, Lote Coimbra, PORTUGAL Tel: Fax: USA Office Critical Software, Limited San Jose, California, USA UK Office Critical Software technologies Ltd New Bond Street, London, UK 33