SIP Issues since adding inbound

[Jimbo2015]

Hi,

We have a customer who has been making calls out over SIP successfully through their IPO for months. Their inbound calls were coming through ISDN30 before but then they moved site so we put their inbound calls through SIP. Since they have moved site and we have placed the inbound calls through SIP they have been experiencing a few issues. Sometimes when they are on the phone and hang up it does not register on the phone and the call stays live but the main issue they are having is that calls are randomly cutting out half way through.

Their IT team assured me nothing has changed on the router since the move except the following;

'The only thing that was changed in the firewall was the IP address on the X0 interface and the default gateway.'

They are using a Cisco ASA router.

The SIP provider said that adding the inbound calls could have caused a NAT issue but wasn't sure how to resolve it on a Cisco ASA.

Our IPO engineer is not the best at resolving these issues so I was hoping if you could let me know if their are any other tools other than monitor that we could be using to diagnose the issue. Also please could anyone else let me know if they have experienced similar issues and if so how they were resolved.

Thanks in advance,

 

[Jimbo2015]

The SIP provider seems to think the Avaya may now be causing the issue as they are receiving 'BYE mesages'

Please could someone take a look at the attached config, our engineer added inbound calls to come in through line 17 and made a change to the SIP URI, I was thinking the second line he added could be causing the issue, as that and the inbound call route are the only changes that were made when adding inbound calls over SIP

 

[BResource]

This could be a router issue. Sometimes SIP ALG or secure NAT can mess up SIP trunks.

Are the calls disconnecting after 32 seconds?

 

[Jimbo2015]

Yes its usually after 32 seconds