thank you for your response,
I think QoS is the most important advantage of IMS to VOIP. if cw does not
support QoS, why we use it?
we can easily use a VOIP server(with additional capabilities like video and
conferencing) and name it IMS?
and there is another issue. as you said, cw uses pjsip and pjsip provides QoS.
based on my research, asterisk also uses pjsip stack, so litterally IMS has the
same QoS as VOIP servers like asterisk
and final question: is there any way to test the QoS of IMS by simulation or in
a real network?
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