Voice over IP with OpenCom 100-Family

Transcription

1 Voice over IP with OpenCom 100-Family Short Way to Ingenious Applications for Multi Sites and Home Office

2 Voice over IP often is often spoken about but the benefits for the customers is not even really understood. Lots of data leased lines are used by companies for the data transfer between different sites. Others are connected to the internet provider by DSL connections and use an IP-VPN for safe the data tunnel. Only the telephone calls between the sites are fed through switched network which costs lots of money. Some are trying to invent additional SIP-phones or PC-softphones with Skype to save money on communication. The use is so difficult and ineffective that the cost reduction is paid with additional time for handling and anger. The better way is using the existing infra structure of IP-VPN, DSL and standard or digital telephones by intelligent combination and some added technique in the background. This application manual will help you to understand and get the idea to help your customer on the way to VoIP without disturbing his running workflow. Content 1 SIP-Telephony as a fully integrated solution in the existing PBX Internet-Telephony Networking between sites with SIP Money saving by using existing IP connections or DSL flat rates between sites Q.Sig-Protocol for real networking of PBXes Networking protocol Q.Sig Networking protocol Q.Sig DeTeWe OpenCom 100 additional features VPN connection of Home Office Basic setting of an OpenPhone 63 IP/65 IP for home office: Examples of running routers Voice over IP with OpenCom 100

3 1 SIP-Telephony as a fully integrated solution in the existing PBX 1.1 Internet-Telephony Without an existing leased line or an IP-VPN the SIP-telephony could be the cheap and easy alternative. Necessary predictions are: DSL-connection with enough bandwidth (mainly upstream) and an Internet flat rate for calculated costs (i.e. volume flat rate of 1 Gbyte is enough for hours depending on used CODEC for data compression) Notification of both sites (or 2 lines) to a SIP provider for getting two SIP phone numbers. SIP-Gateways (i.e. SIP-Connect 112 from DeTeWe) for both sites. In the internet the SIP registrar is waiting for notification of your gateway, Than the net knows which SIP number is correlating to which IP address. This notification is renewed every i.e. 30 minutes. If the ISP disconnects the IP connection at midnight and #vergeben# a new IP address running phone calls will be disconnected. New calls can be established after new registration of gateway at the registrar. The phone call connection is established when the PBX (OpenCom 100) triggers the SIP gateway. 1.2 Networking between sites with SIP The easiest way to make phone calls between sites with low budget is the use of SIP. It is a standardised protocol introduced world wide for telephony. Most internet service providers (ISP) committed and are running this protocol as telephone service. The customer can get one or more phone numbers for little money. The calls internally or to other providers within the SIP- family (partner networks with peering without charge) are free, calls to switched network, GSM etc. are charged. The connection requires a DSL access but is independent of any special IP-access or provider. So the SIP-phone-number is also usable in any country, number prefix or zip-code and is transferable to any site. Automated least cost routing or another access code for external line (i.e. 8 instead of 9 or 0 ) routes the call through to SIP instead of ISDN- or analogue trunk. To make calls to partners and other sites of company sometimes it is a very easy handling and did not need expensive equipment. The OpenCom 100-Family supports with SIPconnect 112 and - from Release 8 with internal Gateway M100-IP full SIP-telephony with existing standard phones (analogue, digital, DECT, IP-phones, ). So SIP is as easy as making a phone call. Your customer will love it! The only disadvantage today is the mostly missing DDI, so you need as much SIP phone numbers / accounts as targets you want to access directly (SIP Connect 112 supports 4 Accounts max.). Voice over IP with OpenCom 100 3

4 1.3 Money saving by using existing IP connections or DSL flat rates between sites There are routers on the market supporting not only IP but ISDN connections via the currently used IP VPN connection. This allows the use of IP connection between sites for standardised PBX networking. Both sites are in parallel wired with analogue or digital trunk which is better (sometimes necessary!) for emergency calls. It does not really help to send an emergency call i.e. from Boston/USA to the fire brigade in Rome/Italy because your call is routed through the IP network to your head office anywhere on earth. The ISDN-/IP-router routes the phone calls transparently through the IP connection. Because of using an additional ISDN trunk it is used as a normal trunk line. LCR with automated trunk selection and different trunk code for manual trunk selection offer all needs for easy use with out large manuals or special handling. Some routers (i.e. SmartNode from Patton/Inalp) are offering two or four voice channels (1 2 BRI) with transparent transmission of DSS1 or/and Q.Sig protocol with additional features better than ISDN only. The connection requests fixed IP addresses or DynDNS 1. For using Q.Sig with the SmartNode router an additional licence is necessary. The networking between OpenCom PBXes (OpenCom 100 and OpenCom 1000) is directly supported from Release 8 for OpenCom 100 with the internal IP gateway modules. Therefore no special BRI router then will be necessary from Q II/2006. PSTN DECT Q.Sig on BRI trunk Q.Sig on BRI trunk DECT PSTN VPN Internet BRI- BRI- Company Site Remote Site Picture 1: Two sites with OpenCom 100 each and Inalp routers to the Internet and connection with BRI to the PBX. Both sites have own access to PSTN / ISDN BRI trunk lines. Att.: The Q.Sig connection offers additional features against ISDN. A BRI trunk and a PBX is not really necessary on both sites because IP connection supports even DeTeWe system phone sets as even from 2006 the DECTnetIP. So the DECT network with multi cell roaming and handover does not need a PBX on remote sites. All subscribers and DECT PPs are real subscribers of the main PBX. 1 If a router uses DynDNS, in every case of establishing a connection it registers with the ISP at and there the actual IP address of DSL connection corresponds with an earlier at DynDNS defined URL. 4 Voice over IP with OpenCom 100

5 DECT M100-IP Gateway VPN Internet Remote site with without PBX Picture 2: Remote site with router only for connection of IP-phones and DECTnetIP. The remote phones are usable as normal system phones on the PBX with full functionality, busy lamp field etc. 2 Q.Sig-Protocol for real networking of PBXes The Q.Sig protocol was designed for networking/interworking of PBXes from different manufacturers. It is used for main- and sub-pbx or the connection of DECT servers to existing main PBX and connection of sites via leased lines over long distance with more than ISDN features. 2.1 Networking protocol Q.Sig BC Basic Call CLIP CLIR COLP COLR AOC CONP CNIP Transit Counter compatibility switch 2 for die networking with other manufacturers: o length of Call Reference on BRI/S0 o format of CHI element on BRI/S0 2 This switch allows conformity with products from other manufacturers on a defined minimum base. Voice over IP with OpenCom 100 5

6 2.2 Networking protocol Q.Sig DeTeWe OpenCom 100 additional features These features are supported only on networking of OpenCom 100: VIP-function Announcement deactivate LCR transmission of priority type (internal, external, VIP, door call etc.) for call queue CFx (call forwarding all conditions) via leased lines (directing information for channel saving in case of CF) Transit function (against loop in case of cascaded call forwarding) Messenger (instant messaging with OpenCTI 50) is usable in networking OpenCom 100 also in connections through transit PBX. 3 VPN connection of Home Office The most wanted professional feature of VoIP is the home office as a subscriber of the main PBX with full system functionality. The CEO and the doctor, layer or craftsman also is at home working and on telephone available as in the office. He can make calls with the CLIP of the office, read s and work with data on the office server like being in office itself. Customers, deliverer and colleagues guess him being there. Also for flexible working i.e. sales people not blocking a desk it is the optimised working place. Connected with the HotSpot at train station or in hotel the colleague can use the time working. To realise this scenario it is only necessary to establish an IP VPN connection (virtual private network). All you need are the following things: a VPN router on DSL access at company site the fitting VPN client on the PC or laptop (and a headset) the client SW should be from router manufacturer otherwise compatibility problems will occur the softphone installation on the PC DSL access with enough bandwidth (home and office) mainly the upstream bandwidth is the bottleneck for telephony For a successful voice stream are bandwidth of 8 80 kbitps necessary depending on requested voice quality. About 80 kbitps are equal to ISDN, 48 kbitps to DECT because of the IP overhead for TCP/IP transmission. For phone calls with customers the quality should not fall short of DECT quality. Only if the necessary bandwidth is not available the quality of GSM is acceptable. The echo compensation between the end user equipment ha sto be guaranteed because of the absolutely not guaranteed quality of internet. 6 Voice over IP with OpenCom 100

7 DECT M100-IP Gateway VPN Internet Home-Office Picture 3: Company site with OpenCom 100 with VPN router and home office. Trunk access (PSTN) at OpenCom and home office only based on a PC with VPN client, softphone and headset as a fully featured subscriber. DECT M100-IP Gateway VPN Internet Home-Office Picture 4...same as above but with a real OpenPhone 63IP / 65IP and a hardware VPN router (no TFTP at home office necessary) Voice over IP with OpenCom 100 7

8 3.1 Basic setting of an OpenPhone 63 IP/65 IP for home office: While booting the phone (plug in supply cable) press menu key change local from passive to active TCP/IP: give a fixed IP address and the netmask of the home network segment (no DHCP necessary) Gateway: fill in IP address of VPN router in own net segment (this is the gateway for VPN tunnel to OpenCom) TFTP: IP address of OpenCom at company site (the other side of VPN tunnel) for download of OpenPhone-software (alternative a local TFTP server could be used) Registration: IP address of OpenCom at company site for telephony, port Examples of running routers On OpenCom 100 site: Zyxel ZyWALL 5 (pictures 2, 3, 4) Netgear FVS338 (at the moment no use of SIPConnect112 with this router!) (pictures 2, 3, 4) Nortel Contivity xxxx (pictures 2, 3, 4) Patton SmartNode 4552 for networking of two PBXes with BRI ports supporting Q.Sigfeatures (picture 1) For home office or small extensions (one or two clients) of OpenCom 100: Zyxel ZyWALL 2 (pictures 2, 3, 4) Netgear FWG114P (pictures 2, 3, 4) Use for client only: Zyxel P334 WT (Wireless router with 2 VPN tunnels for 2 clients) (pictures 2, 3, 4) Softclient from Netgear (for Softphones only) (picture 3) Not yet tested: Allnet ALL0276VPN DeTeWe Systems GmbH Zeughofstr. 1 D Berlin Germany salessupport@detewe.de - Tel.: +49-(0) Fax: +49-(0)30/ Issue: 10/2005_2, subject to changes!