[SIPForum-discussion] SIP over TCP

Raghul Prasanna raghul82 at yahoo.co.uk
Tue Aug 9 07:40:21 UTC 2011

HI Mehmet,
 What if the TCP socket times out, I believe there is a timer for TCP connection as well, I mean sometimes I have seen TCP connection sending RST message which resets the connection, do you think configuring the SIP UA behind NAT to send SIP options regularly would solve this?
Set the SIP options interval less than the TCP socket time out interval?

--- On Tue, 9/8/11, mehmet <eng.mehmetozi at gmail.com> wrote:

From: mehmet <eng.mehmetozi at gmail.com>
Subject: Re: [SIPForum-discussion] SIP over TCP
To: "Raghul Prasanna" <raghul82 at yahoo.co.uk>
Date: Tuesday, 9 August, 2011, 7:03

well, according to my current knowledge, I do not think SIP session expiration depends TCP or UDP. When session expires UAS or UAC sends RE-INVITE or UPDATE, to refresh the session.This will be same in UDP and TCP too . Also session expiration time can be configured on the server maybe and client side . Using TCP just supply you to be sure that your SIP packet has reached the destination or not.Do not think TCP has an advantage in SIP NAT scenarious.
PS : But if you use STUN server, or any Sip Server which has well modificated you may not have NAT problems.

2011/8/8 Raghul Prasanna <raghul82 at yahoo.co.uk>

Ok I am pasting my previous mail again, I have never used SIP over TCP, so was looking for

'Is SIP over TCP useful in NAT scenario?

How often does a TCP session time out or this depends on UA's settings.

Say if an UA behind NAT initiates the SIP session over TCP, if the TCP session times out I believe the call will get disconnected correct? 

Are there any advantages using TCP over UDP in SIP NAT scenario? Please explain.'

--- On Mon, 8/8/11, mehmet <eng.mehmetozi at gmail.com> wrote:

From: mehmet <eng.mehmetozi at gmail.com>
Subject: Re: [SIPForum-discussion] SIP over TCP

To: "Raghul Prasanna" <raghul82 at yahoo.co.uk>
Date: Monday, 8 August, 2011, 21:15

Can you repeat your question again please about SIP over TCP?

2011/8/5 Raghul Prasanna <raghul82 at yahoo.co.uk>

Hello All,
Has anyone in this forum got experience working on SIP over TCP please?

Because I posted a question sometime ago, there was no response, I updated again to see if  someone can respond, but my update never appeared on this forum at all.


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