Paolo Bevilacqua Sat, 05/05/2007 - 14:29

Good. Further question, would SIP to the GW in some way prevent the nice SRST CCME mode? Shanky ?

thisisshanky Sat, 05/05/2007 - 18:16


When in SRST/CCME hybrid mode, the wan connection is down any way. So the SIP connection to the router will be down. You will have to default to H323 pots dial peers to send calls to PSTN. Not sure if i answered your question.


Paolo Bevilacqua Sun, 05/06/2007 - 04:18

Well, in this design the GW router has the PRI ports on board, so there are no voip DP for pots. I wanted to know if there is some dependency of the SRST/CCME mode with H.323 specifically.

thisisshanky Sun, 05/06/2007 - 09:45

I dont think there is any dependency between SRST/CCME mode and H323 specifically. You may run SIP on dial-peers under SRST mode.

Paolo Bevilacqua Sun, 05/06/2007 - 10:18

Thank you, I feel reassured and my very first CCM installation will be a 5.1 with SIP to the GW and hybrid SRST/CCME on the latter.

thisisshanky Sun, 05/06/2007 - 13:49


This link may help with understanding SIP gateway/trunk configuration.

When the wan connection is up, you can use SIPT from CM to the gateway. When wan is down and phones go to SRST mode, obviously your calls will have to default to H323 pots dial-peers and force calls through the local PRI. Unless you have SIPT provider local to each remote site, you will never use a SIP voip dial-peer under CME/SRST mode.



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