Analog PSTN <-> ISDN

omar.elmohri · ‎04-28-2009

Hello,

I have a FAX server which need to be connected with ISDN lines. And as the solution is in Algeria where there is no ISDN lines.

I think about using a router for conversion from analog to ISDN:

Server|---(ISDN)---|Router(FXO)|------|Analog

Is this possible ? or can I have another alternative for the solution?

Regards,

Omar

Nicholas Matthews · ‎04-28-2009

Hi Omar,

This should work fine.

This would be pots-pots faxing which is common.

It's the same scenario for when a fax machine is connected to an FXS port on a router and then sent out ISDN, which is commonplace.

-nick

omar.elmohri · ‎04-28-2009

Nick,

You means that I can use an FXO port to connect to the phone network with analog. And FXO to provide the connection to the server ? Is that should works ?

Regards,

Omar

Nicholas Matthews · ‎04-28-2009

Hi Omar,

If you want to do:

FS--PRI--GW---FXO--PSTN

This is fine and will work.

-nick

omar.elmohri · ‎04-29-2009

Nick,

It's OK.

I want to know other things:

Does the PRI interface will simulate the ISDN network (not the ISDN phone) ?? And do I can use only a PRI interface ?

Regards,

Omar

Nicholas Matthews · ‎04-30-2009

Hi Omar,

You can use an interface like T1 CAS or E1 R2 if the fax server supports it. This is going to be limited by the fax server, not the router.

And yes, the router can do network side of the PRI. Simply add 'isdn protocol-emulate network' under the 'Serial 0/0/0:23' interface.

hth,

nick