Dale Worley wrote: > On Fri, 2009-02-20 at 15:46 +0530, Chaitra wrote: > >> This is regarding call forwarding an Inbound call from an ITSP to an SCS >> user or PSTN numbers. >> Consider the following scenario: >> Inbound call made using bandwidth.com terminates on user 200 in SCS who >> has set a call forwarding (if no response) forward to another PSTN >> number (ring for 30 seconds) >> Default serial fork expiration = 20 >> > > Are we sure that a 1xx response has been sent to the ISP within 32 > seconds? > > According to the flowchart on page 128 of RFC 3261, the callee has > "Timer B" time to send a 1xx response or the caller can consider the > call timed-out. According to the table on page 265, the default Timer B > value is 32 seconds. > > Dale > > It has been sent. However, if it never gets to the ITSP that could be problematic. SipXbridge will not forward 100 but will generate one when the inbound INVITE is consumed. A wireshark trace will tell the story.
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