[asterisk-dev] UAC leg cancel on early media / MoH.
rj2807 at gmail.com
Fri Nov 2 17:38:12 CDT 2007
Quoting from section 22.214.171.124 of RFC 3261:
If the UAS desires an extended period of time to answer the INVITE,
it will need to ask for an "extension" in order to prevent proxies
from canceling the transaction. A proxy has the option of canceling
a transaction when there is a gap of 3 minutes between responses in a
transaction. To prevent cancellation, the UAS MUST send a non-100
provisional response at every minute, to handle the possibility of
lost provisional responses.
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