Transfer between FXS

Unanswered Question
May 16th, 2007

Hi all,

I have VIC2-2FXS module inserted in 2801 router what i wanna do is when i receive external call on specified extension in FXS port to be able to transfer it to another FXS port. What should i configure on router?

Thnx in advance

I have this problem too.
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Paolo Bevilacqua Wed, 05/16/2007 - 03:08


do you use CCME / H.323 / MGCP ? Transfer with analog ports requires a script called H.450, it is not very very easy to make it work.

044102947 Wed, 05/16/2007 - 04:08

I haven't configure anything except FXO port to PSTN and FXS cards and i have configured dial-peer's for both of them and nothing else.

Paolo Bevilacqua Wed, 05/16/2007 - 04:21

OK, the documention (a bit scarce) is at;

then you need access to CCO with download privileges to download the script itself. As I said, all in all, not an easy task.

What is your objective? If you are building building a small PBX you should get the IP phones, then with the same router you can use the CME feature that supports transfers, Auto-attendant, and much much more.

044102947 Wed, 05/16/2007 - 04:35

In small branch we have 4 phones connected via FXS interface, they realized their phones through VoIP. Now they need a phone line from telco so i am testing some features. I have installed number in FXO and now i am trying to transfer calls between extensions this is that i want to achieve.

Paolo Bevilacqua Wed, 05/16/2007 - 04:42

it's doable, but a bit complicated.

Do you have a CM or CME somewhere? In that case you can enable the FXS extensions to be SCCP endpoints, this way a whole lot more features will be available to the phones. See:

If you want to use just plain voice support, the only way is the H.450 script mentioned above, it is kept in the "CCME individual files" for customer with download access on CCO.

044102947 Wed, 05/16/2007 - 05:05

I don't have any CM or CME in network neither CCO account with download access. Everything that i can do is searching the internet for configuration examples or something like that.

Paolo Bevilacqua Wed, 05/16/2007 - 05:33

See if the builtin session script does for you. The configuration link I've indicated before.

My recommendation would be however that you configure CME on the 2801 with SCCP local endpoints. That will serve both FXS and IP phones. If it is your first IPT design, may take a little to master, but the result is real nice.


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