Hi Christer,
Glad to see that the draft starts its WGLC process.It's really useful.
I still have some difficult in using IETF and cannot find the whole
sorted comments about this draft, so i have some doubt about this draft.
1. "If a forking proxy receives a reliably sent 199 response for a
dialog, for which the proxy has previously generated and sent a 199
response, the proxy MUST forward the 199 response."
Does it describe the case below? Although P1 have sent a 199 response,
P1 havs to forword the send reliably 199 too.Or is the first 199 mistaked
for 18x?
UAC P1 UAS_2
--- INVITE ------>
--- INVITE (leg 2) ->
<-- 199(leg 2) --
<-- 199 (leg 2) -----
<-- 199(leg 2) --
2. "10. Usage with 100rel
When a 199 Early Dialog Terminated provisional response is sent by a
UAS, since the provisional response is only used for information
purpose, the UAS SHOULD send it unreliably even if the 100rel option
tag [RFC3262] is present in the Require header of the associated
request."
I have seen a comment on this question,but still not understood about it
.
If the INVITE has a Require tag "Require: 100rel",does the UAS still use
unreliable 199 response?
If 199 is reliable, there is one more advantage. If the 199 arrives
before
the first 18x response, UAC can discard the first 199 and process it
until
UAC receives the first 18x response that has the same to-tag as 199, as
the reliable 199 should be re-transmited until received PRACK.
ps:
Can anyone show me how to sort all comments of a topic by time?
Regards,
Eric.wang
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