[SIPForum-discussion] Carrying additional information in a SIP message.

[prasanna c]

Hi,

+ Yes, you can carry any information in a SIP message. You can introduce your SIP header to carry the IP address and the port number.
+ If the requirement is just to pass on the IP address & port number, then you may want to use INFO SIP message, without establishing any call.

Regards,
Prasanna

To: discussion at sipforum.org
From: pkayyanar at in.com
Date: Wed, 14 Oct 2009 17:35:41 +0530
Subject: [SIPForum-discussion] Carrying additional information in a SIP message.

Hi all,

I have  a requirement like,  an IP address and a port number is got from an external application which has to be carried in a SIP message to another gateway. This additional information like IP and port is used by another application on the remote gateway side to establish a TCP connection to the gateway which initiated the SIP Call.

Now my question is

1. Is it possible to carry any additional information in a SIP message.
2. If so which appropriate SIP message can be used.
3. How can I differentiate between a normal SIP Call(voice call) and this Call which carries additional information.

The constraint is the gateway which initiated the SIP Call, should also disconnect the call, on dissconect the remote gateway which established a TCP connection will disconnect the TCP connection too. 


Example:

Remote Gateway 1                                Remote Gateway2

   ---------- INVITE (SIP Message)----------------&g
 t;
                 To
                 Additional Info:
                 IP and port

  <----------200 OK-------------------------------------

  ------------ACK---------------------------------------->

<---------- Open TCP Connection------------------

<----------BYE--------------------------------------------

-----------200OK---------------------------------------->

<----------Close TCP Connection ------------------

Note: The SIP message used in this example is only to demonstrate the scenario.

Please let me know if there any specific SIP request that can carry additional user information.


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