Hi, all
According to the SDP handling rules described in section 13.2.1 [Creatingthe Initial INVTE] of bis-09,
the UAC must treat the first SDP it receives as the answer, and must ignore any subsequent SDP answers.
But If I consider the case of Prepaid Card Service, the description in section 13.2.1 make me some confusion.
1. User A dial the Prepaid Card Serivce number
2. The session is directed to the application server(AS).
3. The AS propmt to get the destination information.
4. The User A says the destination number. (TTS)
5. The AS direct the session to the destination.
According to the SDP handling rules described in section 13.2.1 [Creatingthe Initial INVTE] of bis-09,
the UAC must treat the first SDP it receives as the answer, and must ignore any subsequent SDP answers.
But If I consider the case of Prepaid Card Service, the description in section 13.2.1 make me some confusion.
1. User A dial the Prepaid Card Serivce number
2. The session is directed to the application server(AS).
3. The AS propmt to get the destination information.
4. The User A says the destination number. (TTS)
5. The AS direct the session to the destination.
If the AS actively collect the
destination information, the audio data in RTP should be transfered to the AS.
So, I think, the AS can add the
SDP for its own to collect the information. But this SDP can be different that
of the UAS, destination.
User
A
AS
User B
| INVITE
with SDP_A
| |
|-------------------------->| |
|
| |
| 183 with
SDP_AS
|
|
|<--------------------------|
|
|
|
|
|<== 'Give
me your destination'
|
|
| ==> 'amazon.com'
|
|
| |
INVITE with
SDP_A
|
|
|--------------------------->|
|
|
|
| 200
with
SDP_B
| 200 with
SDP_B
|
|<--------------------------|<---------------------------|
| |
|
ACK
|
|------------------------------------------------------->|
|
|
Could anybody tell me is there
any misunderstanding or wrong assumption in my thought?
Thanks
forward.
Regards,
Jay
---------------------------------------------------------
Jay H Kim
R&D Center XENER Systems Inc.
Office: +82-2-3482-4900. ext.411
Fax: +82-2-3483-4902
+mailto:[EMAIL PROTECTED]
Jay H Kim
R&D Center XENER Systems Inc.
Office: +82-2-3482-4900. ext.411
Fax: +82-2-3483-4902
+mailto:[EMAIL PROTECTED]
Homepage: www.xener.com
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