Hi Vikas: TCP has a hand shake to acknowledge that data was received by the other side. In the sipX SIP stack all we worry about is if the socket is still known to be good before sending. SIP requires resends if there is no respond from the other side, even over TCP. So if a socket has gone bad, but we do not know it yet, its ok.
Here is why: + let say the socket is bad, but we don't know yet + we attempt to send a SIP message + the TCP socket returns successfully saying it sent the bytes + no TCP ACK comes back and TCP attempts resends, but still fails + its too late to get this TCP error out to the SIP stack, but thats ok + as there was no SIP response, we attempt a resend, this time we get a socket write error. Then the SIP stack should attempt to reconnect the socket and/or failover using DNS SRV and try the next alternative address. I hope this helps. If you are looking to accomplish something else by checking the socket status, please let me know. There are more active alternatives to keeping the sockets connected specified in the SIP outbound IETF draft. We have not yet come across the need for these yet. It would be great to understand how you are using sipX. Cheers, Dan --- On Fri, 1/16/09, VG <vikasraigu...@gmail.com> wrote: > From: VG <vikasraigu...@gmail.com> > Subject: [sipxtapi-dev] TCP Connection Break? > To: sipxtapi-dev@list.sipfoundry.org > Date: Friday, January 16, 2009, 5:04 AM > Hi, > > I like to know is there any mechanism is supported in tapi > regarding tcp > connection breakdown. > > Let suppose : > User A sending Sip on TCP -> Server > Now if link gets down how could this Server comes to know > that Link is down. > > Or server still wait for the response from Client. > > Is there any way to find out Connection Break Down in TCP.. > >From both end Sending and Receiving. > > Please update me regarding it. > > Thanks in advanced. > Regards, > Vikas Gupta > _______________________________________________ > sipxtapi-dev mailing list > sipxtapi-dev@list.sipfoundry.org > List Archive: > http://list.sipfoundry.org/archive/sipxtapi-dev/ _______________________________________________ sipxtapi-dev mailing list sipxtapi-dev@list.sipfoundry.org List Archive: http://list.sipfoundry.org/archive/sipxtapi-dev/
