No Names Allowed!
Voice Gateways / August 3, 2012

Last week I was knee deep in SIP.  To be totally honest, I haven’t really had a customer who has wanted to use SIP this many ways ever.  We’re doing SIP integration to Unity Connection, all of the phones will be registered as SIP devices, we have several SIP trunks spread throughout the organization in addition to the integration with Cisco Unified Presence Server.  Every time I turned around there was some new SIP profile I was making . Everything went uncharacteristically well.  Everything that is, unless you count some trust issues that CUBE and I had.  I guess that’s wrong, the CUBE trusted me just fine, it was just some of these other devices that I wanted it to talk to that it wouldn’t trust.  I tried to speak to it rationally and tell it that I knew these devices and it could trust them, but no go. You see, after release 15.1(2) of IOS, Cisco made some toll fraud prevention measures default.  One of these measures is to have the router automatically add IP addresses that you point to with dial-peers to the ip address trust list.  That’s a list that tells the router who it will accept…