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Vega Gateway
Scenarios
A Pre-sales Engineer’s
guide
This guide has been written to assist the pre-sales engineers of VegaStream’s distributors and
their resellers.
The guide details a set of standard configurations along with key considerations and
rd
party interoperable products.
recommended 3
A guide to the scenarios and information you will find within this document are listed below.
1. VoIP between sites
2. VoIP between si
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1. VoIP between sites Aim: To reduce inter-site call costs without changing the user experience Many multi-site companies find that staff making calls between sites is a significant company expense. Finding a method of reducing to zero the ongoing costs of these calls would be a real benefit to the bottom line. By inserting a Vega gateway between the PSTN and the PBX the Vega gateway can groom calls that are destined for other site(s) onto the IP network. All other calls from
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Telephony Network • E1 Euro ISDN signalling is supported by Vega 400 and Vega 100 • T1 NI1 & NI2 signalling is supported by Vega 400 and Vega 100 • T1 Loop start, Ground start and Wink start CAS signalling is supported by Vega 400 and Vega 100 • BRI Euro ISDN signalling is supported by Vega 50 BRI • Analog connection is possible, but is not preferred (for details on analog connectivity see later section) IP Network • Recommend – private IP network between sites • Can be any reliable
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Future extensions • Add home-workers • Extend the “on net” group to a group of companies who regularly call each other so all calls between these companies are free • Connection to an ITSP for cheaper off-net calls – and possibly for more flexible ingress of national, international or non-geographic numbers. If PSTN connectivity is not reliable at any site then VoIP can be used as a backup to route • outbound calls via a different site. • More than 2 sites to be interconnected rd 3
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2. VoIP between sites and home-worker / remote office Aim: To reduce inter-site call costs without changing the user experience, and adding in basic home-worker support Many multi-site companies find that staff making calls between sites is a significant company expense. Finding a method of reducing to zero the ongoing costs of these calls would be a real benefit to the bottom line. Also, with more and more people working from home – either permanently or just occasionally – it is
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Telephony Network - For PBXs • E1 Euro ISDN signalling is supported by Vega 400 and Vega 100 • T1 NI1 & NI2 signalling is supported by Vega 400 and Vega 100 • T1 Loop start, Ground start and Wink start CAS signalling is supported by Vega 400 and Vega 100 BRI Euro ISDN signalling is supported by Vega 50 BRI • • Analog connection is possible, but is not preferred (for details on analog connectivity see later section) - For home-workers • Analog FXS gateway to connect to analog phone
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When the Vega receives a call from the PBX to that phone number it will groom the call off and forward it to the home-user. USPs • Vega dial planner capability provides powerful routing decision making. For example, calls can be routed based on dialled number prefixes, full numbers, and even on who is making the call. Considerations • Check the numbers that are presented to the PSTN consider for example: - does the PBX present both National format and local format numbers to the PBX
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3. VoIP between sites and home-worker / remote office using a proxy Aim: To reduce inter-site call costs without changing the user experience, and adding in more advanced home-worker support Many multi-site companies find that staff making calls between sites is a significant company expense. Finding a method of reducing to zero the ongoing costs of these calls would be a real benefit to the bottom line. Also, with more and more people working from home – either permanently or jus
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This configuration can form a good starting point for migrating to VoIP without immediately losing the existing telecoms infrastructure. The Vega can be configured to either route specific telephone numbers to the SIP proxy – where only a small set of numbers is to be handled by the VoIP system, or all calls can be forwarded to the Proxy for it to decide how all calls should be routed. Use of a Proxy can also assist in NAT and firewall traversal. If a significant proportion of the c
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- For home users who are routed via the proxy • Home-workers will be able to dial extension numbers of any of the PBXs (as the proxy will resolve the phone number and route the call to the appropriate Vega gateway). Calls made to users on a PBX will appear to the PBX to come from the PSTN and so will not provide the advanced functionality to the home-worker that an extension user would have (e.g. voice mail, call transfer, conferencing). The advanced features available to the home- work
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• Program in fixed number length dial plans where possible to avoid the DTMF timeout delays incurred when routing calls to variable length numbers • Call transfer from PBX to PBX will only work if call transfer PBX to PBX worked across the PSTN (the PBX may block this). • If extension number dialling of the far end PBX or home-workers is to be used (rather than just grooming off the full dialled destination number), remember the extension number will have to be prefixed with the PBX’s ‘con
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4. Analog long line extensions Aim: To allow 1 or more remote sites / home-workers to have extensions on a centralised PBX, retaining all the PBX’s analog phone functionality When expanding into new offices it can be expensive and inconvenient to set up a new PBX or run analog leased lines from the main site to the new remote site. Data infrastructure between sites however is essential. Keeping the Main site PBX for all users brings many benefits, including extension number di
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IP Network • Recommend – private IP network between sites • Can be any reliable IP connection, including leased line, line of site laser / wireless connection and satellite • QOS should be implemented to ensure that VoIP packets pass through the network in a consistent and timely manner and are not discarded by congested routers Consider VPN between sites as this: • - removes any issues with firewalls / NAT - encrypts audio and management data For inter-site operation the Internet can
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5. IP Telephony Aim: To gain additional features available through use of VoIP technology VoIP offers users many facilities and many features currently not known with PBX telephony solutions. Much of the functionality offered by VoIP is controlled through access to the proxy / gatekeeper / media server using a web browser on a PC. Both IP phones and analog phones (via an analog VoIP gateway) may be used to provide telephone access to the users. Intra company calling is fully Vo
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IP Network • Recommend – private IP network between sites • Can be any reliable IP connection, including leased line, line of site laser / wireless connection and satellite • QOS should be implemented to ensure that VoIP packets pass through the network in a consistent and timely manner and are not discarded by congested routers • Consider VPN between sites as this: - removes any issues with firewalls / NAT - encrypts audio and management data • A VPN can be used from the home user to
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6. PSTN toll bypass Aim: To use internet to provide cheap inter-country calling Vega gateways, together with Application servers supporting pre-paid card services allow Telephony Network • E1 Euro ISDN signalling is supported by Vega 400 and Vega 100 • T1 NI1 & NI2 signalling is supported by Vega 400 and Vega 100 • T1 Loop start, Ground start and Wink start CAS signalling is supported by Vega 400 and Vega 100 • BRI Euro ISDN signalling is supported by Vega 50 BRI • Analog conne
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USPs • Vega gateways have been shown to have fast call set-up times and increased call hold times compared to other manufacturers’ gateways due to the quality of the connected call. Considerations • Use of analog gateways to break into / break out of the PSTN may have timing issues over start and end of calls unless line current reversal analog signalling is used. Future extensions • Expansion to a wider range of destination countries and cities through use of ITSP connectivity.
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7. TDM to / from VoIP converter Aim: To allow existing manufacturers of TDM based equipment (switches / IVR systems etc) to have a VoIP offering. Many manufacturers of TDM equipment are being asked by customers about their policy on VoIP. Other customers are more demanding and informing suppliers that a migration path to VoIP is essential. It is expensive to integrate a full VoIP solution into a product ‘just because a customer has asked’. Use of Vega gateways allows integratio
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Considerations • Not all supplementary services supported in ISDN signalling directly map to VoIP protocols. If supplementary service are needed it is important to check that they will map OK. Future extensions • - rd 3 party product choices • - Version 2.1 16 March 2006 Page 19 of 33 Vega Gateway Scenarios. ©2005-2006 VegaStream Ltd. Examples are given in best faith – ensure that you check the capabilities of systems before deploying them, especially the functionality
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8. Leased line eliminator for QSIG connections between sites Aim: To save leased line call costs between sites In larger companies, the PBXs on multiple sites may be linked together via leased lines and using QSIG signalling in order to make the distributed PBXs function as though they were a single PBX. When linking PBXs together in this way, point-to-point connections are required between each and every PBX. This becomes expensive in terms of leased lines. By using the existi
