I am forwarding this mail as the mail that I sent previously are on hold for
its approval from different groups. Please do the needful.
Thank you.
________________________________________
From: Sambasiva Rao Manchili
Sent: Saturday, February 19, 2011 6:07 PM
To: tsvwg(_at_)ietf(_dot_)org; payload(_at_)ietf(_dot_)org;
avtcore(_at_)ietf(_dot_)org; codec(_at_)ietf(_dot_)org
Cc: Antonio Gambin; Markus Locher; Ralf Kühl
Subject: RTP Timestamping in Control messages of IuCS interface.
Hallo,
Can some one in IETF list, please help me to clarify the point w.r.t the Time
stamping in RTP header for Audio Stream AMR 5.9.
I hope I am addressing to right group.
Our implementation of RTP is not accepting the two control messages belonging
to the UPP(User plane protocol above RTP) if the two consecutive control
packets arrived has same time stamp with different sequence numbers.
The two control messages are UPP_INIT_ACK and Rate Control Message which
belongs to UPP layer on IuCS user plane stack.
Our implementation expects the time stamp of second packet to be 320ms greater
than the time stamp arrived in 1st Control message of RTP header.
Our counter part RTP stack says their implementation is right and can have the
same time stamp in the RTP header of these control messages.
RFC 3350 tells about equal timestamps for Video stream belonging to same
frame, but does not specifically tell about the control messages of its upper
layer.
We have read the RFC 3550 , section 5.1 does NOT prevent RTP packets
from having equal timestamps but rather explicitly allows for it:
Several consecutive RTP packets will have equal timestamps if
they are (logically) generated at once, e.g., belong to the same
video frame. Consecutive RTP packets MAY contain timestamps that
are not monotonic if the data is not transmitted in the order it
was sampled, as in the case of MPEG interpolated video frames.
(The sequence numbers of the packets as transmitted will still be
monotonic.)
May I kindly ask the RTP experts in Audio Stream area(or specific to IuCS ) can
please clarify me.
Thank you very much for your time.
Best Regads,
Samba.
This email and any attachment may contain confidential information which is
intended for use only by the addressee(s) named above. If you received this
email by mistake, please notify the sender immediately, and delete the email
from your system. You are prohibited from copying, disseminating or otherwise
using the email or any attachment.
_______________________________________________
Ietf mailing list
Ietf(_at_)ietf(_dot_)org
https://www.ietf.org/mailman/listinfo/ietf