Polycom Vega Gateway - Manual (Page 24)

Version 2.1 16 March 2006 Page 24 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 of devices not designed and delivered by VegaStream.
9.b Analog breakout to the PSTN – e.g. for a company or for a PSTN toll bypass
A Vega FXO can be connected directly to PSTN lines.
Calls from VoIP into the PSTN specify the desired destination number by sending DTMF tones
into the PSTN.
Considerations
• Disconnect supervision is only supported by physical signalling – line current reversal or
loop current disconnect; no voice or tone detect can be configured on the Vega to indicate
end of call
• Answer supervision is only supported by physical signalling – line current reversal
• Calls received on the telephony interface arrive with no dialled number information as
analog signalling just uses a ringing voltage to indicate the call arrival.
• Different impedances are required for ‘approved’ connection in different countries. Europe
should have the Vega FXO interface configured for CTR21 impedance; the US should have
the interface configured for 600R operation. 900R impedance is also available.
VoIPon Solutions www.voipon.co.uk [email protected] Tel: +44 (0) 1245 600560