EVM-HD-8FXS/DID as backup

[Chris Deren]

Customer wants 12 pots lines for backup in case the PRI is down. I was thinking of using EVM-HD-8FXS/DID which will give me 8 DIDs and 4 port FXO card or FXO expension module. The question is can I make outbound calls on these lines when configured as DIDs? Is there a better solution?

Chris

[gpulos]

u can configure Inbound dialPeers to use the ports for DID as well as configure outbound dialPeers to use the ports for outbound access.

a good link to start follows:

http://www.cisco.com/en/US/tech/tk652/tk90/technologies_tech_note09186a008010e6d1.shtml

[Chris Deren]

Thanks, but my question was not how to configure H.323 routing (I've done that hundreds of times), it is wheather the EVM ports when confiured for DID can be utilized for outbound dialing.

Chris

[thisisshanky]

You should be able to use DID trunks (as long as telco provision them as DID trunks) and set all the FXS ports to DID mode. You get 8 base FXS ports on the EVM and you can either add 6 FXO cards or add a 3 FXS/4FXO card or another 8 port FXS port daughter card (expansion module). In DID mode, you wont get any dialtone (much like FXO)

I am not sure if DID mode is available on the expansion cards. Also if you mix and match FXS and DID modes you have to take care of impedance settings. Check this link

http://www.cisco.com/en/US/products/hw/modules/ps2617/products_configuration_example09186a0080513001.shtml

HTH

Sankar

---edited----

I dont think you can configure any ports on the EM cards in DID mode. I strongly believe, you are limited to 8 DID ports (base FXS ports)