Fax over IP or SIP trunks

Fax over IP or SIP trunks! Across the Internet even a G. 711 codec fax transmission is unpredictable. An excellent discussion of why faxing and modems don’t work well over VoIP can be found here. However, people often get perfectly good results on lightly... More

Fax over IP or SIP trunks! Across the Internet even a G. 711 codec fax transmission is unpredictable. An excellent discussion of why faxing and modems don’t work well over VoIP can be found here. However, people often get perfectly good results on lightly loaded LANs. It still isn’t perfect, as a burst of data on the LAN can still upset things, but some people get results they can live with. Fax-over-Internet T. 38 pass-thru functionality within ShoreTel has arrived in 11! In detail: There are two conceptual methods of carrying virtually real-time fax-machine-to-faxmachine communication across packet networks: Fax relay, in which the T. 30 fax from the PSTN is demodulated at the sending gateway. The demodulated fax content is enveloped into packets, sent over the network, and remodulated into T. 30 fax at the receiving end. Fax pass-through, in which modulated fax information from the PSTN is passed in-band end-to-end over a voice speech path in an IP network. The following two Less