hi,

I need to provide a high availability feature for our sip A/S.
The current idea is to add a parameter into some headers of the sip message 
such as the route header, request-uri etc.(it is added to multiple headers 
because external UA may modify some headers such as request-uri)

The parameter will indicate which A/S in the cluster is handling that dialog.
This parameter will be used by a router to route in-dialog messages to the 
corresponding A/S.

The problem comes when the A/S has crashed and the router needs to route a 
message to another A/S. It needs to route the message to some A/S2 & the 
parameter for that dialog needs to be modified accordingly.
However,some header's such as route can be set only for initial requests and 
should not be modified later.

My question is which header can be used/modified reliably for the above purpose 
of storing the parameter?

regards,
Nanda


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