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2 posts

Wannabe Geek

Topic # 100853 19-Apr-2012 18:20 Send private message

Hello All,

I am hoping someone out there can help.

I am trying to connect my Cisco UC320w phone system to my DVX SIP Trunk.

I have got to the point where I the Phone system is saying the SIP Trunk is 'Registered', and the Xport site is saying the interface is connected.

I can dial out, and the receiving party can pick up the call, however there is no audio to either party, and the call eventually drops.

Nor can I receive any incoming calls, and according to WorldExchange, the traffic is not hitting my phone system.

I have a Cisco X3000 router and have set up port forwards on TCP/UDP 5060 and UDP 35384-37384, however it doesnt seem to be working. Have I missed a vital step somewhere, is it possible that this router is not going to do what I want it to do?

The router allows me to set up Port Forwarding, and Port Range Triggering, and also allows me to set up a DMZ device. 

Could this be a NAT problem?

Please help as I am at a standstill.



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252 posts

Ultimate Geek
+1 received by user: 5


  Reply # 612079 19-Apr-2012 18:53 Send private message

afaik the x3000 is a basic adsl router - i'd use the x3000 in bridge mode and use the uc320w to "Route Voice & Data"

i use a uc320w with a cisco 871 which has SIP inspection and have no problem. Port forwarded 5060, allowed through the firewall and restricted to accept SIP traffic only from wxc.

happy to give you a config for an 857 if you have access to one.

19208 posts

Uber Geek
+1 received by user: 1087

Biddle Corp

  Reply # 612090 19-Apr-2012 19:28 Send private message

No audio on a call is almost 100% guaranteed to be a NAT issue.

436 posts

Ultimate Geek

  Reply # 612192 19-Apr-2012 22:30 Send private message

Does it work if you put it into the DMZ?

19208 posts

Uber Geek
+1 received by user: 1087

Biddle Corp

  Reply # 612227 20-Apr-2012 06:24 Send private message

gchiu: Does it work if you put it into the DMZ?

A DMZ isn't necessary the solution if the problem is one of one way audio due to incorrect IP's featuring in the headers.

436 posts

Ultimate Geek

  Reply # 612233 20-Apr-2012 07:35 Send private message

Wouldn't it help though in debugging the problem?

3558 posts

Uber Geek
+1 received by user: 60


  Reply # 612234 20-Apr-2012 07:37 Send private message

The issue will be nat but SIP natting most likely, the reason the cal drops and they cant hear you is the actual SIP 200 connect message that is sent to you when the far ends picks up the call will not be getting back to the unit, the call will drop with a timer expiry if it doesn't see the 200 OK after a certain time period, it also will not connect the Audio untill it does ...

If you send me your details and some times then we can take a look, but as Steve points out it will most likely your natting set-up.

Yes I am a employee of WxC (My Profile) ... but I do have my own opinions as well Wink


2 posts

Wannabe Geek

  Reply # 620087 5-May-2012 13:09 Send private message

I finally managed to get this working. It was just a case of playing around with the incoming port forwarding and external IP address. working alright so far
Thanks for your help

1 post

Wannabe Geek

  Reply # 624913 14-May-2012 15:04 Send private message

I don't suppose you would be willing to detail the settings you used? I've been unable to get VFX working through a WAG160N and there doesn't seem to be much difference between the devices, at least in the interface.

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