7942 Hang up on outbound call

[TotalPunch]

I have a Cisco IP 7942 on SIP firmware 8.5.3SR1S.
It has been successfully registered on a external VOIP server.
Not our server, of a service provider. 
They say they have tested the phone and it just doesn't work on their system.

Incoming calls work, sound and everything.

But on outbound calls it doesn't.

If I call my mobile phone, my mobile rings.
In wireshark I can see the SIP package INVITE, RINGING all normal.
But then out of nowhere the phone decides to send a SIP CANCEL.
Resulting in the call being terminated before you even have the time to answer.

I don't get why this is happing.

[M02@rt37]

Hi ,

please read this:

https://andrewjprokop.wordpress.com/2014/05/07/understanding-sip-cancel

Best Regards,

If this helps, please rate.

Ben

[TotalPunch]

It does help explain what the CANCEL package is, thank you for that.

It however doesn't explain why it is happening
Cause I'm not hanging up.

[R0g22]

There must be something going on that is causing the phone to send a cancel. Can you share the pcap here ? Also share the IP addresses for your phone and the proxy ?

[TotalPunch]

The wireshark file

[TotalPunch · Accepted solution]

Just upgraded to newest firmware : 9.4.2SR3-1S.

Now. it does work.

Apparently a problem in that specific firmware version.

Thanks for everyones help.

[Wonxie]

i have same problem but i am using CIPC

[Maren Mahoney]

Wonxie,

I doubt it is exactly the same problem. I would suggest creating a new post with a description of your problem and what troubleshooting you have already done. You are more likely to get a response to your problem that way, rather than tagging a comment on an old post.

Maren