FXS vs FXO

[Duaneness]

Good day everyone. I am trying to connect an Avaya G3si v9.5 to a stand-alone FreePBX box, which will be used for voicemail only. I have a PRI T1 in place which mostly works - calls go to the correct mailbox, and messages are left. However I can't get MWI to work at all. I have tried a number of things, including two different Calista boxes, and nothing has worked.

So I'm thinking of switching over to an analog connection. I can get a 4-port analog card to replace the PRI T1 card, but I need to know which modules to put on it - FXS or FXO. I envision three ports used to answer calls, and one port used for MWI signalling. All would be connecting to a TN793CP. I think I need 3 FXS and one FXO, but I really don't know.

Can any of the gurus out there give me a shove in the right direction?

Thanks in advance -

- Duane

 

[dialtonebone]

Is your PRI enabled with QSIG? If not, see if you can use QSIG for MWI. A PRI will almost always be better than an analog connection for both features and interoperability.