MLPP on gateways

Posted: June 3, 2006 by sankar in CM4.1 Features, MLPP

** MLPP settings does not work on FXO gateways.

** MLPP does work on gateways with T1 PRI and CAS (MGCP).

** No support for MLPP in H323 gateways. But on a ICT you will see a setting for Premption Indication. A trunk itself cannot be Prempted, so there is no way to enable Premption on an ICT. The premption indication on a ICT, helps in passing MLPP indication when a precedence calls is placed from one CM Cluster to another CM cluster.

Sample lab for MLPP testing on gateways: 

1. Set the gateway with MLPP Indication enabled and MLPP Premption enabled. Setup 1026 and 1027 with capability to call Exec override and Flash override respectively.

2. Set up a route pattern 9.@ in Exec partition with Exec override settings

3. Set up a route pattern 9.@ in Flash partition with Flash override settings

4. Point both 9.@ patterns to the MGCP T1 gateway. Busy out all channels except 1 channel. MLPP works only when the trunk is busy. Use B channel maintenance to do this.

5. Place a flash override call from 1027 and then place a exec override call from 1026. The call to 1027 is disconnected and the call from 1026 is connected to the dialed.

6. Place a exec override call from 1026 and then place a flash override call from 1027. The call to 1027 will not succeed and a Block Premption  Announcement is heard. "A equal or higher precedence call has prevented the completion of the call. Please hangup and try again later. This is a recording"

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