[asterisk-dev] T1 sip 500ms or 1s ?

[Mark Michelson]

Eduardo Nunes Pereira wrote:
> But, do the "qualify" equal "yes" have a influence over that rule ? 
> forgive my knowledge about asterisk internals, but "qualify" option is 
> used to send OPTIONS packages ? [ qualify=no ]
> 
> And the first retry of REGISTER after expire time continues with delay 
> 1000ms
> 

qualify sends OPTIONS requests to the peer. The time taken to respond to the 
OPTIONS is used as timer T1. If you do not have qualify enabled, then Asterisk 
uses a default of 500 ms for T1.

Asterisk appears to be scheduling its first retransmission of requests after 2 * 
T1 instead of just using T1. This same logic is used for all request types that 
may be retransmitted.

Mark Michelson