Hi all,
I want to explore the case where a FAX call is made using the SRTP.
The case is like this,
UA-1 UA-2
------------------INVITE (SDP = SRTP)-----------------------> The
UA-1 generates INVITE with desired SRTP credentials
<----------------200 OK (SDP = SRTP)------------------------- The
UA-2 responds with 200 OK with negotiated SRTP credentials
--------------------------------ACK------------------------------------>
---------------------SRTP with FAX tones----------------------> FAX
tones in secure RTP packets are exchanged between UA-1 and UA-2
<-------------------SRTP with FAX tones------------------------
<-------------------INVITE (T.38 UDPTL)-------------------------
UA-2 identifies the FAX tone and determines that the call is FAX call and
sends re-INVTIE with T.38 UDPTL as it is configured as FAX option in it
---------------------200 OK (T.38 UDPTL)---------------------->
UA-1 responds with 200 OK to complete the FAX transmission over UDPTL
<-------------------------------ACK------------------------------------
<-------------non secure T.38 UDPTL packets-------------- UA-1 and
UA-2 stops secure RTP and exchanges the FAX over non secure UDPTL packets.
---------------non secure T.38 UDPTL packets----------->
Is this a valid scenario?
Is there any device/UA who behaves like this?
Is it practical to update the session of secure RTP with non secure UDPTL
(or even normal RTP) using re-INVITE at the middle of the session?
Thanks,
Mohit Soni
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