[SIPForum-discussion] Cannot register with SIP server

[Tomasz Zieleniewski]

Hi,

If You are able to debug Your UAC application then You can find out if the
problem lies on UAC side or not.
Perhaps when UAC initiates SIP request it sends it through random port in
such case there can be some sort
of limitation for that.
If You say that there is a session established ("auto played voice msg
within a few seconds")
then there can be for instance a NAT or firewall issue between UAC and SIP
Server.
Keep in mind that when You use UDP there is no socket opened, just datagrams
between ports.
I suggest trying to check if the server is really listening on the SIP port
to which You are trying to connect.
U can use a great nmap tool to do that both for UDP and TCP.

Kind regards,
- Tomasz Zieleniewski

2009/7/1 Mike Jiang <mike.jiang at andersontaylor.com>

>   Hi, All
>
>      I just ran into a problem of registration with the SIP server suddenly
> when switching to a new SIP server provider.
>
>      In order for the UAC to send register SIP msg to the SIP server, first
> the UAC tries to open a socket to the SIP server, the UAC calls the Winsock
> to do that (running in a mobile 6 system). A few times it worked. Very
> often, it’s failed. I don’t know what happened. So we put an infinite loop
> over there, and the UAC keeps trying that until success.
>
>      I guessed the SIP server must received some things from the UAC since
> the UAC received the auto played voice msg within a few seconds. The voice
> msg was from the SIP server. I asked the tech support guys of the SIP server
> provider if they found any thing coming from the UAC, they said nothing
> received except two empty packets. They said their server doesn’t accept any
> socket connection except for SIP messages. I repeatedly told them that the
> socket is a channel, like a pipe connected to two endpoints, while the SIP
> is a protocol defining the msg type by the SIP header and runs over top of
> TCP or UDP. Looked like they confused themselves with two different items.
>
>
>
>      So my question is: for not making a socket connection, is it a problem
> on the UAC side or on the SIP server side?
>
>
>
>       Really appreciate any helps,
>
>
>
>       Mike J.
>
>
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