Version 7.0 447 Mediant 3000
User's Manual 22. Digital PSTN
Call setup (terminating device): After the terminating device receives a SIP INVITE
request with a 'Content-Type: application/QSIG', it sends the encapsulated QSIG
Setup message to the Tel side and sends a 200 OK response (no 1xx response is
sent) to IP. The 200 OK response includes an encapsulated QSIG Call Proceeding
message (without waiting for a Call Proceeding message from the Tel side). If
tunneling is disabled and the incoming INVITE includes a QSIG body, a 415 response
is sent.
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:
1. In the Digital Gateway Parameters page (Configuration tab > VoIP menu > Gateway
> Digital Gateway > Digital Gateway Parameters), set the 'Enable QSIG Tunneling'
parameter (EnableQSIGTunneling) to Enable on the originating and terminating
devices.
2. Configure 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).
3. Set the ISDNDuplicateQ931BuffMode parameter to 128 to duplicate all messages.
4. Set the ISDNInCallsBehavior parameter to 4096.
5. Set the ISDNRxOverlap parameter to 0 for tunneling of QSIG overlap-dialed digits
(see below for description).
The configuration of the ISDNInCallsBehavior and ISDNRxOverlap parameters 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 encapsulated in SIP INFO
messages to the remote party.
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