3cx not sending ACK for 200ok from PABX.

[qasarider]

Hi,
We are trying to use 3cx (v10) connecting to a PABX SIP trunk, however when the PABX sends 200OK, the 3cx does not send any ACK and the call will be drop by the PABX after 30sec because there is no ACK from the 3cx. Does anyone know why 3cx is not sending the ACK? Attached is the wireshark capture. Thanks.

 

[AWS2P]

Are you using a V10 PBX ? if so , surely no one will be able to say something about so old 3CX release

 

[qasarider]

We get the same result when we tried to use newer version.We use older version only to do a quick test the make sure the PABX SIP interface is setup correctly. Hope someone can help. Thanks.

 

[JohnS_3CX]

hi,

You might want to repeat your post with V16 and also read here before you post anything
https://www.3cx.com/community/threads/information-to-provide-when-requesting-help.67558/

Also, run the capture on the PBX as well as the registrar because now you are only seeing the conversation from one side only

 

[leejor]

So....the other PBX (which type?) is registering to 3CX, Bridge trunk, or extension. Or, 3CX is registering to an extension on the other PBX. I was unable to open the file you posted as its is a pcapng file and Windows does not know what to do with it, and I'm not about to go looking for something to download to deal with it.