Baniel,
SIP HA is available - it may just take some configuration. I know
/ have worked on systems that provide in dialog failover. The posting from
Jason(?) below stating that the address is not used, from and to tags are
used to correlate messages with existing dialogs, is appropriate.
Regards,
Wayne.
*********************************************
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
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