I have a SIP Trunk, Cisco 877 and an old 2611XM for VoIP running CME 4.1. The routers are set up like Fibre->877->2611XM. I've finally got some things working on my setup, I can make internal, POTS and outgoing SIP calls.
I've got 10 numbers allocated to the SIP trunk and 8 lines. Each external number should be a DDI for an internal extension, the last 4 digits of the external number is the internal extension.. Outgoing calls all come from a single number (I've got that working).
My problem is that I can't get incoming SIP calls working at all. 've been trying for the last 8 hours with no success. At the moment, I'm not sure if its a NAT problem on my 877, or a dial-peer problem on the 2611. I'd really like some help
I've got the following NAT on my 877:
ip nat service sip tcp port 5060
ip nat pool SIPPORTFWD 192.168.1.254 192.168.1.254 netmask 255.255.255.0 type rotary
ip nat inside source list 1 interface Dialer1 overload
Hi Andy. As mentioned in many posts here in this forum, this is a tipical nat issue. Remove static nat associaton to the Cube. If you have multiple interface bind signaling and media to the interface leading to the internet by issuing bind all source-interface g0/0 under voice service voip -> sip. Also under voice service voip you can add ip address trusted list ipv4 x.x.x.x y.y.y.y (address an subnet mask)
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I can get an incoming call to ring a phone, but the call can't be established (plus, there's no security on this and I can occasionally see other people try and bounce calls through my CME).
I think what I need to do is put static NAT on so I can only accept calls from 188.8.131.52/7/8 never any other addresses and forward this to my CME box, then tell the CME to ignore the loopback interfaces and send calls out via fa0/0.1 - its difficult as I'm using CME 4.1 and some commands don't work.
I supose the only other option I have is using a bridge (again with an ACL for those IP addresses) and placing an interface on the CME directly on the Internet, but this is far beyond my skills at the moment!
I'm really stuck with this now, please can someone help?!
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