Calling party number randomization

[Zahir Raihan]

I need to randomize the calling party number either by CUCM or by gateway . can anybody help me out ?

[Vivek Batra]

I hope you meant from randomize is to manipulate the CLI as per your requirement. This can be done in CUCM at various levels viz on phone configuration itself, Route Pattern, Translation Pattern, Route List level and on trunk/gateway also (inside CUCM) through transformation patterns.

[Zahir Raihan]

Hi Vivek,

My requirements is as follows.

outbound calls through PSTN will be made frequently from IPT .Each time the Number is Dialed the called party will see different incoming caller number which in not related to originator caller number (IPT) . we have a number pool for outgoing called party number. can you give a specific example . I've search transformation pattern and gateway and trunk and everywhere I have to put specific pattern which doesn't randomize it.

thanks in advance

Zahir

[Vivek Batra]

If I understand your requirement correctly, every call made even from same extension should carry different CLI to PSTN network.

Without knowing complete installation scenario, I guess what you can do here is use different transformation patterns (for same extension) and configure it on multiple trunks. Bundle those trunks in a Route Group and use 'Top Down' algorithm. In this way, each time new trunk/gateway will be selected and different transformation pattern can be forced.

Does it serves your requirement?

[Zahir Raihan]

hi vivek,

thanks for reply. but we have a single h323 gateway and a single CUCM cluster. And Calls going outside using h323 to from CUCM and then another sip dial-peer from gateway to the service provider. So  multiple trunks are not available.

[Vivek Batra]

Which trunk type you have in gateway connecting to provider?

[Zahir Raihan]

SIP trunk

[Vivek Batra]

I'm not sure if there could be better way to achieve your requirement but what here can be done to have multiple SIP Trunks from CUCM connecting to same gateway. Let there be only one trunk in gateway connecting to service provider. Now in CUCM on multiple SIP trunks, you can have multiple transformation patterns to manipulate the CLI of same DN.

Let say on SIP1, you manipulate the CLI from 301 to 4444-301.

On SIP2, you can manipulate the same DN (301) to 5555-301 and so on.

Route Group can be configured accordingly to distribute the call to multiple SIP trunks connecting CUCM to gateway.

Does it makes sense?

[Jaime Valencia]

This is NOT possible, neither the GW nor CUCM provide what you're looking as out of the box features, if at all possible, you would need to build your own TCL script to change the calling number on the fly, and I'm not even sure if it would be possible to randomize it.