Overhead Paging via Cisco Voice Gateway

[richardbuxton]

Hello,

I have a CUCM6BE implementation that uses 2800 routers as Voice Gateways to the PSTN.

The customer has an overhead paging system that consists of a analog 600ohm input to an amplifier which then connects to speakers. The previous PBX had a physical paging port which connected to the amp input.

I need to implement the paging system to the 2800 VGW.

I have found a document that describes the use of E&M for overhead paging. Is it possible to connect the 600ohm analog input directly to pins 4&5 of the E&M port, and then to call this port to access paging?

(Note: There is a PAM10 buffer/filter in front of the amp's input)

Does anyone know if this is possible, using FXS (ideal) or E&M VWICS? Any help would be much appreciated.

Regards

Richard

[Rob Huffman]

Hi Richard,

FXS or E&M should work nicely in this setup. Here is a good doc I received from Paolo;

Using Analogue E&M Ports to Interface to Overhead Paging Systems

http://cisco.com/en/US/tech/tk652/tk653/technologies_configuration_example09186a008015094e.shtml

Or something like this with an FXS Port would also work well;

http://www.camelectronics.com/botateacmo.html

Hope this helps!

Rob

[richardbuxton]

Hi Rob,

Thanks for the quick response and info.

The document describes the paging system having a switching pair (ie. push to talk). In my case the paging system is simply an analogue output.

I have tried connecting this to an FXS port and the port immediately goes off hook and it is not possible to call it.

I was hoping that by connecting it directly to port 4&5 the port could be set to auto answer and connect the speech path.

Do you know if this is possible?

Regards

Richard

[Yongbing WU · Accepted solution]

Somebody post a solution in this forum several years ago. Use a cheap IP phone and configure auto-answer to headset or speaker. Find the audio cable of headset or speaker. Connect the audio cable to your amplifier. That is it.

Hope this helps.

[Rob Huffman]

Hi Richard,

Lets forget about the E&M for a moment :) If you look at the "Loop Start" section of this doc;

http://lib.store.yahoo.net/lib/cam-electronics/TAMBm.pdf

You will see that the TAMB answers the call via FXS on T&R and then bridges the audio across to the Paging Amp on dedicated pairs. You will need this mid-point device. I have worked with others who have successfully used this product.

Hope this helps!

Rob

[richardbuxton]

Hi Rob and 4bwu,

Thanks very much for the advice.

As the customer already has some spare IP phones I am going to try the headset port option but if this is not suitable I will suggest that the customer purchases a TAMB unit.

Regards

Richard

[tim.bryson]

You can also use this Valcom V-9940 and a Small Valcom power supply.

http://www.valcom.com/v-9940.htm

It will connect by FXS or FXO port and will give you a 600 or 8 ohm output.

It also supports loop supervision.