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Japan TTC Q931-a Private Networking Protocols
401
Administration for Network Connectivity
555-233-504 — Issue 1 — April 2000 CID: 77730
B Private Networking
TTC Q931-a Protocols
The TTC defined private networking ISDN protocol is largely based upon ITU-T
Q.931 protocol. DEFINITY ECS supports the following TTC defined protocols:
Basic Call support as defined in JT-Q931-a “Digital Interface between PBXs
(Common Channel Signaling) — Layer 3”
Number Identification Services as defined in JT-Q951-a “Digital Interface between
PBXs (Supplementary Services) — Number Identification Services”
Differences from ITU-T Q.931 include:
• symmetrical operation as Peers similar to QSIG protocol, i.e. No Network/User
definition
• different protocol discriminator
• Progress Indicator IE not supported in DISCONNECT messages
• Timers T310 and T313 are disabled
• Sending Complete IE not supported
• NOTIFY messages are not supported.