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By ming1340
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#5434

Hello every body,

I am newbies here and i meet the problem on FoIP message. I would like to discuss about the FoIP Message is abnormal or not if the "m=image 0 udptl t38 " ? If the Port = 0 , is it mean that we can't make the session between me and remote end ?

Here is the full message :
CSeq: 1 INVITE
Contact: <sip:172.26.34.117:5060>
Supported:
Allow:ACK,BYE,CANCEL,INFO,INVITE,OPTIONS,PRACK,REFER,NOTIFY,UPDATE
Accept:application/dtmf-relay,application/media_control+xml,application/sdp,application/x-broadworks-call-center+xml,multipart/mixed
Content-Type: application/sdp
Content-Length: 267

v=0
o=BroadWorks 167077 2 IN IP4 172.26.34.117
s=-
c=IN IP4 172.26.34.117
t=0 0
m=audio 20434 RTP/AVP 8
a=sendrecv
a=rtpmap:8 PCMA/8000
a=ptime:20
m=image 0 udptl t38 :devil:
a=T38FaxVersion:0
a=T38FaxRateManagement:transferredTCF
a=T38FaxUdpEC:t38UDPRedundancy

Thank you.

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By WelshPaul
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#5436
Hi @ming1340 ,

While i'm no fax guru, everything looks normal in the above INVITE. :thumbsup:
ming1340 wrote:If the Port = 0 , is it mean that we can't make the session between me and remote end ?
Port 0 is a reserved port in TCP/IP networking, meaning that it should not be used in TCP or UDP messages.
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