Supporting more phones with SRST on a Cisco 2811

[networkservices]

I have multiple sites with Cisco 2811 routers installed. How can i use SRST aggregation to give me support for more than the default 36 IP Phones on the 2811 router?

[a-vazquez]

Yes, with CCM 3.3(2) in which restriction of running SRST feature on a default gateway was removed, you can run multiple routers as SRST routers to support more phones than supported limit on each router. However, please be aware of the call transfer/forwarding limitation if you're not running SRST 2.0 up on both routers. And also note that dial-peers/dial-plans need to be carefully planned and configured for call transfer/forwarding to work properly

This URL speaks about Cisco Survivable Remote Site Telephony should helps you:

http://www.cisco.com/en/US/products/sw/voicesw/ps2169/products_qanda_item0900aecd8028d113.shtml