Hi all,
I meet a weird case with precondition but can not find any document talk
about it:
I make SIP call from my system to the fax machine. In the initial INVITE,
my system includes precondition in Supported header and status in SDP. But
fax machine does not support precondition so it removes p
As I know, according to RFC4733 section 2.5.1.1:
If the sender receives an "events" parameter from the receiver, it
MUST restrict the set of events it sends to those listed in the
received "events" parameter.
Both UAC and UAS must use telephone-event for DTMF, your case is invalid.
2018-03-02 5:
Hi,
There is any standard/RFC for this?
Because my system only accept telephone-event packet and drop all in-band
DTMF when I use SDP as below and I'm not sure it is correct.
Thanks,
Anh
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