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Organization: SipXecs Forum
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Message-ID: <[email protected]>



We have two issues here:

1. Invite is being sent only 4 times, while according to the
RFC we need to send 7 for total timeout of 64 x T1.  We
should really follow the RFP.

2. Indeed T1 should be set as an estimate of network
latency, but an estimate of 100msec for a RT on WAN in
general (which may include international locations) and
mobile network in particular is too low, and should be at
least doubled (providing that we fix item 1, otherwise we my
need a higher number for T1, because it takes mobile
networks several seconds to establish a data channel
following issuance of the first invite).

Ideally T1 should be a parameter, which would be adjusted to
strike a balance between  or reliably reaching users, and
need for acceptable timeout for redundant configurations.  
This balance  depends  on application, topology, and other
specifics.  
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