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Community Member

CAS to ISDN PRI signal conversion

I want to connect a PABX with an E1 card set up for CAS signaling to a public (actually GSM) ISDN switch that does not support CAS.

Is it possible to use a Cisco router with 2 E1 interfaces to do the conversion?


Re: CAS to ISDN PRI signal conversion

Since there has been no response to your post, it appears to be either too complex or too rare an issue for other forum members to assist you. If you don't get a suitable response to your post, you may wish to review our resources at the online Technical Assistance Center ( or speak with a TAC engineer. You can open a TAC case online at

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.

Community Member

Re: CAS to ISDN PRI signal conversion

A Cisco AS5350 can handle the conversion since it now supports tandem switching

So your PBX E1 will be incoming and the E1 into your switch will be outgoing

and then u configure your dial-peer as necessary.If u need further assistance,contact me at and

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