Hello guys!
I am from MOBICOM provider side of this issue. This our customers Siemens Hi Path 4000 pbx register to our proxy server by sip trunk using +97675779982 sip account number. Registration was successful but outbound calls rejected. From the trace i can see that Siemens sending sip INVITE message in wrong format. On the INVITE message from uri field was pbx local extension number like <sip:71414@mobileoffice.mn>.
INVITE sip:95344523@202.131.248.20:5090 SIP/2.0
Via: SIP/2.0/UDP 172.16.20.6:5060;rport;branch=z9hG4bK569003adaf4379036.6c78d6ddc57b78def
Route: <sip:202.131.248.20:5090;lr;transport=udp>
Max-Forwards: 70
From: "Ã.ÆABÇAHÅÌÊAM" <sip:71414@mobileoffice.mn>;tag=ef1bbf733c
To: <sip:95344523@mobileoffice.mn>
Call-ID: 97ccd9718ea68f2b
CSeq: 27160 INVITE
Allow: INVITE, ACK, OPTIONS, BYE, CANCEL, REGISTER, INFO, PRACK, UPDATE
Contact: <sip:71414@172.16.20.6:5060>
Min-SE: 90
P-Asserted-Identity: "Ã.ÆABÇAHÅÌÊAM" <sip:71414@mobileoffice.mn>
Session-Expires: 1800
Supported: 100rel, timer
User-Agent: HiPath 4000 V5.0 M5T SIP Stack/4.0.26.26
Content-Type: application/sdp
Content-Length: 356
v=0
o=MxSIP 131094 133166257 IN IP4 172.16.20.6
s=SIP Call
c=IN IP4 172.16.20.6
t=0 0
m=audio 29100 RTP/AVP 8 18 4 98 99
a=rtpmap:8 PCMA/8000
a=rtpmap:18 G729/8000
a=rtpmap:4 G723/8000
a=rtpmap:98 telephone-event/8000
a=rtpmap:99 red/8000
a=silenceSupp

n - - - -
a=fmtp:18 annexb=no
a=fmtp:4 annexa=no
a=fmtp:98 0-15,32-36,49
a=fmtp:99 98
From uri field must be sip account number like <sip:+97675779982@mobileoffice.mn>. Please advice to our customer how to configure it.
BR,
Ganzorig Boldbaatar