Invalid o=- header" returned by the SIP provider

Asterisk Asterisk SIP
1

Hi,

May be you could help me to understand this " Invalid o=- header" returned by the SIP provider,

INVITE sip:0579701110@voip.myopenip.fr SIP/2.0
Via: SIP/2.0/UDP 81.64.182.179:5078;rport;branch=z9hG4bKPjb4c85f54-f1a0-4a46-a700-fa59ab8477e2
From: sip:0978499619@81.64.182.179;tag=04fdbb81-266c-4140-9919-b96f8650e14c
To: sip:0579701110@voip.myopenip.fr
Contact: sip:0978499619@81.64.182.179:5078
Call-ID: 14d5b92c-5dc8-4954-9e31-0ec69c46d05f
CSeq: 26937 INVITE
Allow: OPTIONS, REGISTER, SUBSCRIBE, NOTIFY, PUBLISH, INVITE, ACK, BYE, CANCEL, UPDATE, PRACK, MESSAGE, REFER
Supported: 100rel, timer, replaces, norefersub
Session-Expires: 1800
Min-SE: 90
Max-Forwards: 70
User-Agent: FPBX-15.0.16.75(16.13.0)
Content-Type: application/sdp
Content-Length: 339

v=0
o=- 1300615293 1300615293 IN IP4 192.168.0.29
s=Asterisk
c=IN IP4 192.168.0.29
t=0 0
m=audio 10014 RTP/AVP 0 8 3 111 9 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:3 GSM/8000
a=rtpmap:111 G726-32/8000
a=rtpmap:9 G722/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20
a=maxptime:150
a=sendrecv

<— Received SIP response (368 bytes) from UDP:94.143.87.216:5060 —>
SIP/2.0 400 Invalid o=- header
Via: SIP/2.0/UDP 192.168.0.29:5078;received=192.168.0.29;branch=z9hG4bKPjb4c85f54-f1a0-4a46-a700-fa59ab8477e2;rport=5078
From: sip:0978499619@192.168.0.29;tag=04fdbb81-266c-4140-9919-b96f8650e14c
To: sip:0579701110@voip.myopenip.fr;tag=aprqngfrt-fp4vma3008qi3
Call-ID: 14d5b92c-5dc8-4954-9e31-0ec69c46d05f
CSeq: 26937 INVITE

Incoming Calls are ok, only outgoing calls are in trouble.

Thanks for your help,

2

The provider has a broken SDP parser. Who is the faulty provider?

3
4

How could I be sure to send the right message ?

The provider suspects that my router or something like that corrupts the sended message. Could il be possible ?

5

If your router has SIP ALG, which is when the router examines/manipulates the SIP messages, then yes it is entirely possible.

6

Thank’s a lot, it could be the reason.

Unfortunately, there is no ALG parameter on the router.

7

I’m wondering if they are looking for an alphabetic character to terminate the type. It depends on whether they are saying “o=-” because that is all they got, or because they think it is the type.

8

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