Version 6.2
651
February 2011
SIP User's Manual
11. Tunneling Applications
Mid-call communication:
After the SIP connection is established, all QSIG
messages are encapsulated in SIP INFO messages.
Call tear-down:
The SIP connection is terminated once the QSIG call is complete.
The RELEASE COMPLETE message is encapsulated in the SIP BYE message that
terminates the session.
To enable QSIG tunneling, use the following settings:
Set the EnableQSIGTunneling parameter to 1 on the originating and terminating
devices
Set the QSIGTunnelingMode parameter for defining the format of encapsulated QSIG
message data in the SIP message MIME body (0 for ASCII presentation; 1 for binary
encoding)
Set the ISDNDuplicateQ931BuffMode parameter to 128 (duplicate all messages)
Set the ISDNInCallsBehavior parameter to 4096
Set the ISDNRxOverlap parameter 0 (for tunneling of QSIG overlap dialed digits - see
below for description)
For a detailed description of these parameters, see ''ISDN and CAS Interworking
Parameters'' on page
The configuration of the ISDNInCallsBehavior and ISDNRxOverlap parameters as
mentioned above, allows tunneling of QSIG overlap dialed digits (Tel to IP). In this
configuration, the device
delays
the sending of the QSIG SETUP ACK message upon
receipt of the QSIG SETUP message. Instead, the device sends the SETUP ACK message
to QSIG only when it receives the SIP INFO message with SETUP ACK encapsulated in its
MIME body. The PBX sends QSIG INFORMATION messages (to complete the Called
Party Number) only after it receives the SETUP ACK. The device relays these
INFORMATION messages to the remote party, encapsulated in SIP INFO messages.
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