We have approx 15 or so fax machines connected to a VG-248>call manager>(mgcp)gateway>pstn.
A group of users with high visibility within our organization has been sending complaints that a high number of outbound fax transmissions fail to various international numbers. I have monitored several of these “failed” attempts and notice that when the destination number answers the call, our end does not proceed to transmit. (almost as if that “handshake” is taking place). Though intermittent, I have been asked to confirm that our “setup” is configured optimally for faxing internationally and that we are configured to "recognize the different kinds of tones" (if that makes any sense). I am looking to the forum for any help about where to even begin this type of troubleshooting. This is a tall order for me, as I am not a voice expert and not even quite sure where to begin looking …the gateway config? VG248 config? The fax machines themselves? Is there any trace of these calls I can gather that will detail what is (or isn’t happening)? I’m grateful for any help you can offer.