[SIPForum-discussion] 180 Ringing is resent while recipient does not respond(with 200 ok) to invitation

[sunil kumar]

can any one help  me out in understandin the Behaviour of recp in the
following case
The problem is as below.
A ---------INVITE---------> B
A<----180 Ringing------   B
 A<----180 Ringing------   B
 A<----180 Ringing------   B
 A<----180 Ringing------   B
 A<----180 Ringing------   B

what should be the behaviour When B fails to Respond with 200ok
1. can it Re-Transmit 180
2.180 should be sent only once to the originator

which is correct and y and if possible one Refference Document?
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