Sip Trunk Configuration

Unanswered Question
Jul 31st, 2009
User Badges:


Sorry if im trying others patience as this is the 3rd discusion ive raised in quick sucsession !

I am trying to configure sip trunk on uc 500.

Ive been given the details from the telecom provider detailed in the attached file.

Could someone point me in the right direction can i do this from cca ?


  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Maulik Shah Fri, 07/31/2009 - 10:40
User Badges:
  • Silver, 250 points or more

Use the Generic SIP trunk provider on CCA 2.0 and configure the SIP proxy server as the IP Direct Connect IP address

For the DDI to extension mapping - you need to go to the incoming dialplan section on CCA as below:

For the caller ID - make sure the you set the Main Caller ID number on the Outgoing dialplan without the 0

SIP on UC520 uses UDP port 5060 by default and RTP ports 16384 to 32767

andrewsymms Fri, 07/31/2009 - 12:07
User Badges:


Thanks for your promt reply.

Still not working keep getting not authorised.

If you could have a look at the attached tech log

Maulik Shah Fri, 07/31/2009 - 12:20
User Badges:
  • Silver, 250 points or more

What is in front of the UC520 as it appears you have:

Ip phones -- UC520 -- DATA VLAN --

If not then can you describe that a bit more - the way you have this configured is that the UC520 will send a SIP invite with a source IP address that is (Data VLAN) - your WAN router would need to ensure it NATs all the private IP addresses from the UC520 to the public IP. If you have a "deb ccsip message" or sniffer capture from the UC520 LAN interface maybe useful as well.

andrewsymms Fri, 07/31/2009 - 22:48
User Badges:


your diagnosis is correct. im not sure the wan router has the capability of nat ing the uc520 ip address to the wan ip address.

would it be better to connect the router to the wan port and re arrange things that way ?

andrewsymms Sat, 08/01/2009 - 08:12
User Badges:


Ive changed the network round a bit now so wan goes out through the wan port on the uc520 to our modem router.

Seems to work fine now


mbram1313 Sun, 08/02/2009 - 21:53
User Badges:

I had luck binding the interface in the stp info in config)#voice service, conf-voice-service)#sip, conf-voice-sip)#bind - Then bind it to the fa0/0 int. If you have statically NATed the fa0/0, don't forget to: ip nat source static udp x.x.x.x 5060 x.x.x.x 5060 extensible, where the first set of x's are any ip address (gateway) on the UC520, and the second set is the outside local address of the fa0/0 interface. Your firewall will not allow SIP traffic through without that static map. Hope it helps...Matt


This Discussion