Hi all, I have question about how the SIP backup proxy function works in Cisco handsets. Im using both 7960 and 7961G.
Im connecting them to 2 Asterisk servers (dont shoot me!!) and they work, very well, Asterisk1 is primary proxy and ASterisk 2 is backup proxy. I know that they are B2BUA not true SIP proxies, but Im not sure thatshould make any difference.
All handsets register to both Asterisk servers, they register to Asterisk1 first and a telnet or ssh to the phone and a "#show config" on the phones show that they are registered to the backup. Problem is that when i drop the ethernet on Asterisk1, the 7961s dont fail over to the backup.
I thought that the phones invite would be sufficient for the call to be placed out the backup, i see the udp to the backup and then the Invite and register, but the phone never actually initiates the call, only does the registration, over and over. I get the same problem using either model, so i dont think its IOS problem. Im think that it may only be possible with CCM,
Any clues or hints??
Any help here would be very much appreciated,
Cheers
Simon