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keyswitch routers

Is there anybody who can tell me about what protocol does keyswitch routers use for local termination of Ip telephones to router. And secondly is the IOS image 12.15 (YD) called vespa image or what is exactly the vespa image.

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Cisco Employee

Re: keyswitch routers

They use SCCP - Skinny Client Control Protocol. This is the same protocol used when those same phones are registered with a Cisco CallManager. Yes, 12.1(5)YD images support Keyswitch or Survivable Remote Site Telephony. Also, 12.2(2)XB supports this on the platforms supporting the feature (2600/3600/IAD2420).

Also note that the newest versions of these features are now called:

Cisco IOS Telephony Service 2.0 (formerly Keyswitch)

Survivable Remote Site Telephony Version 2.0 (formerly SRST)

And these newest versions are in 12.2(2)XT and also support the 1750 and 1751.

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