Yes, G711 (clear channel) is the only voice codec which you can use to send
a FAX. The G729 codec compresses the audio stream by removing all inaudible
frequencies, which FAX machines use, and so a FAX over G729 will always
fail.
Darren Nay
-----Original Message-----
From: Ronald Ramos [mailto:ron@silverbackasp.com]
Sent: Friday, October 29, 2004 9:03 AM
To: serusers(a)lists.iptel.org
Cc: asterisk-users(a)lists.digium.com
Subject: [Serusers] Grandstream HT486 and FAX
Hi All,
I was trying to test to send a fax to an international number.
Here's the setup:
FAX --> HT486 --> SIP PROXY --> GATEWAY --> PSTN --> FAX
Unfortunately I haven't been able to do it, I read somewhere that fax uses
G711 only, is this true? because our gateway provider uses only G729.
does
this mean I can't send fax via that gateway, because of the codec?
So can i do this then,
FAX --> HT486 --> SIP PROXY --> HT486 --> FAX
i'll use G711 on both HT486.
Hope anyone can help me. Thanks in advanced.
Regards,
Ron
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