Case 6: Calls From Main Senderized And Tributary Senderized Circuit Switches; Call Completions - Avaya Communication Server 1000 Series Reference

Call setup sequences
Case 6: Calls From main senderized and tributary senderized circuit
switches
In this case, both the main circuit switch and tributary circuit switch are senderized. This is also
not permitted because of compatibility problems similar to Case 5. Direct trunks must be
provided to the node from the tributary circuit switch. The tributary circuit switch thus becomes
a main circuit switch.

Call completions

Call completions to the following are handled in a normal manner:
• stations on the node
• stations at other nodes
• Public Switched Telephone Network (PSTN) trunks from the node
• Public Switched Telephone Network (PSTN) trunks from the connected nodes
Using TIE Trunks to the main circuit switch, the node completes calls to the following
destinations:
• stations at the main circuit switch
• stations at a tributary circuit switch connected to the main circuit switch
• off-network stations by PSTN trunks terminating on the main circuit switch
• off-network stations by PSTN trunks terminating on the tributary circuit switch
In all cases, call routing to the main is initiated by an off-hook signal sent to the TIE Trunk. The
basic sequences for call completion are as follows:
1. To reach a telephone at the main circuit switch, outpulse the Directory Number
2. To reach a telephone at the tributary circuit switch, outpulse an access code for a
3. To reach a PSTN telephone by a Central Office (CO) trunk terminating on the main,
4. To reach a PSTN telephone by the tributary circuit switch, the node outpulses an
24 Electronic Switched Network Reference — Signaling and Transmission
(DN).
TIE Trunk to the tributary, pause if necessary, and outpulse the Directory Number
(DN).
outpulse the access code for the CO trunk, followed by the PSTN number.
access code for the main to tributary TIE Trunk, followed by the access code to the
CO trunk, followed by the PSTN number.
Comments? infodev@avaya.com
August 2011