Cisco 2821 conneection to ISP SIP Trunk

[childebrecht]

Good afternoon,

I have been provided a SIP trunk IP/port(172.X.X.X, port 5060) to turn up a SIP trunk on my Cisco 2821 router.  Currently this is set up in a lab environment.  Right now I have the system configured for four FXO incoming lines feeding out to a Cisco IP 7XXX phone system.   This has been working fine.

Can anybody provide a sample config on the Cisco 2821 router for configuring the router to using a SIP trunk as incoming connection instead of the FXO ports.  From what I understand GigabitEthernet0/1 will be the port I use for my incoming SIP trunk.  I have not done this before so I do not really know where to start.

I appreciate all the help that I can get.

Thank you,

Chris

[glennbarnas]

I just rebuilt my home 2821 (version 15.1) using a SIP Trunk provider with 2 DIDs.

I can dial in and out using the attached config example. The actual configuration is larger, more DNs and ePhones, but this should be enough to show the process. I also attached a document I wrote some 7 years ago to explain how to set this up.

The ethernet port you use will depend on your network configuration. I have a SonicWALL FW and a port dedicated to my VoIP router, with the proper access and NAT rules to route SIP and RTSP to this port.

Hope it helps!

[childebrecht]

Thank you for getting back with me yesterday evening.

I messed around with this some today but am still having issues dialing in/out.   I know have my SIP itself active per my ISP.

If I attach the config from my Cisco 2821 do you think you could glance over it and possibly see what I am missing.  As I mentioned initially.  I had this set to use 4 FXO incoming/outbound analog lines and those were working correctly.  I think I am just mixing configs for using a SIP trunk with config for using FXO lines.  My SIP trunk connects directly back to my ISP through GigabitEthernet0/1 so I am not routing back to a router or anything.  It is staying on a local direct connection between myself and ISP.  The IP address that my ISP gave me for my SIP trunk was 172.17.63.2 port 5060.  I have a PBX assigned to me as 7403717001 with DiDs ranging from 7403717009-7013.  Thanks again for any assistance you can provide.

[Roger Kallberg]

There are no bind statements set on your dial peers to/from your ITSP. Have a look at this document for how to configure this, https://www.cisco.com/c/en/us/support/docs/voice/ip-telephony-voice-over-ip-voip/211306-In-Depth-Explanation-of-Cisco-IOS-and-IO.html

[Roger Kallberg]

It’s not all that much difference between a TDM voice gateway and a SBC (Cube) voice gateway. It’s in the end boils down to having a pair of dial peers of the type VOIP that does the routing of calls instead of a pair that comprises of one POTS and one VOIP. At this link you’d find plenty of documentation for how to configure your router as an SBC. https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/products-installation-and-configuration-guides-list.html