FW: [AVT] I-D ACTION:draft-ietf-avt-rfc2032-bis-13.txt --> RTP Payload Format for H.261 Video Streams

simao.campos at ITU.INT simao.campos at ITU.INT
Wed Jan 25 09:06:41 EST 2006

In QSIG, which is essentially a symmetrical variant of Q.931, T310 is
stopped on receipt of a PROGRESS message with progress indication 1 or
8. This behaviour is useful for a number of supplementary services where
expiry of T310 could terminate the call attempt too soon.


From: Paul E. Jones [mailto:paulej at PACKETIZER.COM] 
Sent: Monday, January 23, 2006 11:51 PM
To: itu-sg16 at external.cisco.com
Subject: T310 timer and PROGRESS



Recently, I asked what should happen when an endpoint receives a
PROGRESS message indicating that there are in-band tones and
announcements.  Should the T310 timer be stopped?  H.225.0 seems to be
silent on this, but it would certainly seem that it should be stopped.


Should we stop the timer or should the timer continue to run?  It will
expire in short order (assuming a default value), which suggests the
timer ought to be terminated and T301 started.


I would appreciate your input on this.




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