It is really the other way around. The ip phones talk to the callmanager using the SCCP protocol. So the questions is does you nat/pat box support SCCP markup. The pix and most IOS platforms versions of NAT support the SCCP protocol. You will also see it called Skinny. That is the command that will be used on the boxes.
If I have a CCM in headquarters, there is a public ip on it, don't need to do NAT.
I have an ip phone at my branch office with a private ip address, internet connection is ADSL or Cable. I have router( maybe not Cisco) with NAT feature. So can my ip phone register into the CCM, and communicate with other ip phones? If I have two phone in my branch office, and will be natted to on same public ip address, does it work?
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...
If you have 2 ISR routers, one acting as Failover, do we need to have both the same number of SRST licenses on the 2 routers?
No. You will only need the SRST licenses on the primary router. Because this feature...