Hi,
I have a case where one SIP entity sends FAX to other SIP entity during a
call.
SIP-A calls SIP-B(voice call) and the call is up.
SIP-A wants to send FAX to SIP-B, now my question is
from which entity to which entity the SIP INVITE message (with T38 FAX data)
goes?
Based on the document "draft-ietf-sipping-realtimefax-01.txt", the callee
who receives the
fax message sends the INVITE with T38.
5.3.1 Sequence Diagram
IFT UA Proxy IFTGW UA
| | |
| F1 INVITE | |
|------------------->| |
| | F2 INVITE |
| |------------------->|
| F3 100 Trying | |
|<-------------------| F4 100 Trying |
| |<-------------------|
| | |
| | F5 180 Ringing |
| F6 180 Ringing |<-------------------|
|<-------------------| |
| | F7 200 OK |
| F8 200 OK |<-------------------|
|<-------------------| |
| | |
| F9 ACK | |
|------------------->| F10 ACK |
| ------------------->|
| |
| Both Way RTP Media Established |
Fax |<=======================================>|
------->| |
emitted | | |
| | | Preamble
| | |<---------
| | F11 INVITE | detected
| |<-------------------|
| F12 INVITE | |
|<-------------------| |
| | |
| F13 200 OK | |
|------------------->| |
| | F14 200 OK |
| |------------------->|
| | F15 ACK |
| |<-------------------|
| F16 ACK | |
|<-------------------| |
| |
| T.38/UDPT Fax Flow Established |
| Voice connection muted |
|<=======================================>|
End of | |
fax | | |
detected| | |
------->| | |
Is this correct?
Regards,
Ak
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