Well we can get into a long conceptual discussion here... In my opinion SIP does provide some nice recoverability/HA built-in support, by having state/path info incorporated in the messages (e.g Route list, Contact etc).
-uri -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Suheel Hussain Sent: Thursday, November 18, 2004 10:43 AM To: [EMAIL PROTECTED] Subject: RE: [Sip-implementors] UA IP address change after initial The gist is that Sip signalling does not support high-availability. Which is quite odd as a number of telephony and ATM signalling protocols support HA. -suheel Suheel Hussain Email: [EMAIL PROTECTED] >For call control, if contact has IP, subsequent msgs within dialog will >use that IP. I would think msgs will be dropped if failover occurs to >diff IP. >Same with audio stream sent to specific IP/port. >-- Jason >>UA1 is not supposed to maintain IP address as part of the dialogue. In may cases it wouldn't even know what is the IP address of the b2bua as the SIP messages may go through intermediate hops (e.g. proxy). All >>should be fine as long as the call-leg (dialog) identifiers are kept the >>same (call-id, local and remote tags (in the From and To headers >>respectively)). >Hope everyone is in agreement w/ me... >-uri __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
