Thursday, January 8, 2009

I've seen talk on the forums about wanting to bring in a fax directly to 3CX via a VoIP provider. Currently, 3CX only supports faxing via a PSTN gateway device. I'm not saying I disagree with them, but I couldnt help myself from trying to make it work:)

I decided to utilize our BroadVox SIP trunk for this since they support T38 faxing.

Today I was able to have some measure of success in receiving inbound faxes. The key thing to note is that your SIP trunk needs to have "PBX Delviers Audio" disabled and "Support Re-invites" enabled. With this combination I was able to successfully negotiate a T38 session with broadvox and receive a fax.