I have an AS-5300 used by several SIP phones (mostly through Asterisk) to dial from VoIP-land to POTS-land. My current "authentication" method is rather draconian, poor and inflexible: I just played with the routing tables to make sure that the only phones that can have IP connectivity with the voice gateway are those in certain subnets.
Now, I would like to move up to something that provides better granularity. I understand that Radius is an option? There is also an md5 digest authentication method which may or may not be supported by the Cisco gateway?
I am guessing that another (very inefficient) solution would be to set the 'canreinvite=no' option in Asterisk, thereby forcing it to be in the middle of all calls. That would work, right? This solution really sucks.
Can somebody knowledgeable discuss and/or point to some documentation on this topic?
TIA,
-Ramon F Herrera
ps: my phones are Linksys/Sipura. Tips on configuring them for authenticated calls are most welcome.