Hi,

I'm after a bit of help with the attached Wireshark trace, I'm having an issue with a 7100 where the calls are cutting off after 20-30secs, the SIP provider has provided a trace showing the 7100 is continually sending invites which they are saying is causing the issue.

What is odd is that I have two mobile phone numbers, calls to one of the numbers always drop after 20-30secs, and calls to another number never drop.

If I could stop the 7100 from sending out all the invites it might resolve the issue.


7100 is on 5.03, it was on 5.01 but upgraded it when onsite.

I have attached the trace to the other number which always works fine, the trace looks fine on this one without the same issue, why would the Samsung always do Multiple invites to one number but always send a normal invite to another? surly the Samsung just always send the same invite, so I can't understand why one is so different on the trace.

As k the provider why aren't they sending the SIP 183/180 messages on the failed call?

My guess is that because the samsung isn't receiving these that it's re-inviting.

I've seen a fault happen to 1 mobile carrier but not when the mobile carrier was the same provider as the sip trunks. I had to change a setting to fix the issue and never heard back from them about why it didn't affect calls on their network, only to other mobile network providers.

Hi Nameless,

Thanks for the assistance, I have gone back to them and asked to look into this, I have also noticed that they have recently migrated to a new SBC server their end!!

Hi Lacota, The ISP doesn't happen to be Gamma does it?. We've had a few recently where nothing has been changed on the phone system or firewall, but there are suddenly issues with calls cutting off etc. after an endpoint migration, but Gamma insist it's nothing to do with them...