We, the voiphighway, have about 50 alarms running over voip, it is a combination of echo cancellation, silent suppression, force g711 and the carrier you use. The setting can be different for each site, but you should disable echo cancellation and silent suppression, that is how we usually get it to function.

 

Otherwise it is a shot in the dark.  They are all running thru a freeswitch setup in what we call a tandem mode, the calls come from either another freeswitch pbx or pbxnsip hosted server and we relay the calls onwards.  Be sure to use bypass media, the less times the rtp touches something, the better chance you have of it working.

Darcy

All,
I am trying to get an alarm system which calls a central monitoring center to work via FreeSwitch.  I am using a Linksys SPA-1001 and a SIP trunk (Vitelity).   Even though the call is answered the "modems" never connect, from what I can tell.  I see the call being answered in Freeswtich, but the alarm system reports a "comm error".   PCMU is being used for the call and it does hang-up with "NORMAL_CLEARING".

Does anyone have any ideas how to get "modems" to work over VoIP?  Any suggestions would be appreciated.

Thanks
Kubes

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