Hi All,We are facing problem in registering the IP phones and Cisco ATA who are behind symetric NAT.What is the solution for this? How can a device behind symetric NAT can work/communicate with a Cisco SIP Proxy Server which is on a public IP address...

We have noticed that for all the conversation related to Cisco Sip Proxy server remains unsolved, Should we think that no-body have control on the product?There are no reference guide as well, the only document available is Administrator guide, Insta...

How can we authenticate a IP phone through its MAC address?

Hi AllWe are using cisco 5300 as a SIP gateway with 96 channels (4 T1s), my question is can we dedicate/restrict channels to user. For example if we have 4 users on one gateway and want to dedicate VoIP Channels 20, 25, 28, 15 to each users, and they...