Polycom Vega Gateway User Manual

Page 11

Version 2.1

16 March 2006

Page 11 of 33

Vega Gateway Scenarios.

Examples are given in best faith – ensure that you check the capabilities of systems before

deploying them, especially the functionality of devices not designed and delivered by VegaStream.

• 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 ‘connect to PSTN’ digit; usually 9 in UK, but can be 0 in
Europe.

• If IP connectivity fails, calls can be programmed to be routed over the PSTN instead; there

may, however, be a bit of delay in deciding that the IP connection is down.

• Ensure that only authorised home-worker / remote office users can make outbound calls to

the PSTN – avoid just anyone with SIP connectivity to the internet being able to make calls
through the Vega and to the PSTN

• Where a media server is used, consider placing it close to where the media is going to be

used – this minimises the distance over which ‘fat data pipes’ are needed to route audio
traffic.

Future extensions

• Remove PBX and make all users IP users

• 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

party product choices

• SNOM, Mitel MKC, IVR technologies, NetSapiens

VoIPon Solutions www.voipon.co.uk [email protected] Tel: +44 (0) 1245 600560