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406 error on notify

I have a 8841 phone and all of the sudden it is giving me 406 errors on notify. The BLF lights on the phone all started blinking, that's how I noticed.

What is wrong in this SIP header?

 

NOT Dec 05 14:23:44.107733 (658:687) voice- =====> Send (UDP) [185.xxx.xxx.xx]:5060 SIP MSG:: NOTIFY sip:mypbx.domain.com SIP/2.0^M
Via: SIP/2.0/UDP 213.xxx.xx.xxx:5065;branch=z9hG4bK-108530cb;rport^M
From: "Backoffice" <sip:702@mypbx.domain.com>;tag=28fc52fe39a5d33ao0^M
To: <sip:mypbx.domain.com>^M
Call-ID: 722fb083-88681192@192.168.10.122^M
CSeq: 41 NOTIFY^M
Max-Forwards: 70^M
Contact: "Backoffice" <sip:702@213.xxx.xx.xxx:5065>^M
Event: keep-alive^M
User-Agent: Cisco-CP-8841-3PCC/11.1.2^M
Content-Length: 0^M
^M

NOT Dec 05 14:23:44.186203 (658:687) voice- <===== Recv (UDP) [185.xxx.xxx.xx]:5060 SIP MSG:: SIP/2.0 406 Not Acceptable^M
Via: SIP/2.0/UDP 213.xxx.xx.xxx:5065;branch=z9hG4bK-108530cb;rport=5065^M
To: <sip:mypbx.domain.com>;tag=89eee713^M
From: "Backoffice" <sip:702@mypbx.domain.com>;tag=28fc52fe39a5d33ao0^M
Call-ID: 722fb083-88681192@192.168.10.122^M
CSeq: 41 NOTIFY^M
User-Agent: 3CXPhoneSystem 15.5.15502.6 (15502)^M
Content-Length: 0^M
^M

1 REPLY
Beginner

Re: 406 error on notify

Anyone who can help me by having a look at this sip header?

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