Tag Archives: Voip

Fax & Voip – Part 3/3 – Baud Rate & Fax Relay

Decrease Baud Rate and turning off ECM Packet loss, jitter, and latency all add up to corrupt a fax transmission in VoIP env and unfortunately also in Asterisk PBX. When a fax machine determines that some data is lost, it … Continue reading

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Acer Revo M1-601: How to install Asterisk & Freepbx

To begin you need to install Debian 8.1. Critical step in the installation process. Non-free firmware When the installation process ask for “Some of you hardware needs non-free firmware¬† – the missing firmware files are rtl_nic/rtl8168g-2.fw”, you need to dowload … Continue reading

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Add T.38 Fax capabilities in Asterisk 13 and Freebx 12

Fax in Voip Env….. Joy and pain…. In this post I’ll show how to configure Asterisk 13/FreePbx 12 to use T.38 Fax capabilities to receive fax using SpanDSP (FFA not work in Asterisk 13….). IMHO when possible is better configure … Continue reading

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Fax & Voip – Part 2/3 – From Vad to Clock……

Codec Translation I have already mentioned before. In the path caller->called codecs can change several times, and every transformation can introduce distortion and delay. To minimize fax issues all the legs involved must be using the same codec to avoid … Continue reading

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