[VoiceOps] Weird Adtran TA-900 problem

Chris Wallace lists at iamchriswallace.com
Wed Sep 28 09:37:03 EDT 2011

I have seen this on our IAD's where we are doing NAT.  Adtran's feedback was perform the following…

Create an access-list to match SIP signaling.
ip access-list extended voip-sig
  permit udp any  any eq 5060   
  permit tcp any  any eq 5060 

Create an entry in your policy class that is assigned to your external interface and make sure it is at the top of the list.
ip policy-class Public
  allow list voip-sig self

Change the RTP port the IAD's uses
ip rtp udp 50000

Change the IAD to not preserve the NAT ports
no ip firewall nat-preserve-source-port


On Sep 27, 2011, at 2:45 PM, Matthew S. Crocker wrote:

> Hello,
> I have a weird problem with one TA-900 on my switch.   Other TA-900s are working fine.
> Inbound calls to the TA from Broadworks fail with a SIP timeout.   The INVITE is hitting the TA but it isn't responding with a 100 Trying.
> If I force the TA to re-register the FXS ports inbound calls start working for a short period of time (couple minutes)
> If a FXS user makes an outbound call it works and inbound calls work for a short period of time.
> I have packet captures from the adtran (debug ip packet <filter> dump) showing the INVITE coming in from Broadworks (Acme SD actually)
> When I enable SIP debugging on the TA I don't see anything in the terminal for the INVITE,  like the TA isn't treating the traffic as local
> When phones are working (after outbound call) I see debug traffic like I would expect.
> This screams of a NAT issue but the TA is directly connected with a T1 and a real IP (no NAT).  The registration in the acme shows no NAT and the registration expire timer is 3600 seconds.
> The Adtran is configured for NAT for its internal eth0/0 port and I have one linksys phone connected internally.  The linksys phone appears as behind NAT in the acme with a 30 second registration timer.  The linksys phone works fine through the whole process.
> Anyone see any issues like this before?
> Firmware Version	A4.08.00.E
> -- 
> Matthew S. Crocker
> President
> Crocker Communications, Inc.
> PO BOX 710
> Greenfield, MA 01302-0710
> http://www.crocker.com
> P: 413-746-2760
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