Configuring Voice Services
Using a FAX Machine
Cisco Small Business ATA Administration Guide 50
4
G.726-40
G.729a
G.723
Using a FAX Machine
You can connect a fax machine to an FXS port on the SPA2102, SPA3102,
SPA8000, and SPA8800. T.38 Fax is supported on these devices, for fax
transmission over an IP network. The SPA2102 and SPA3102 support a single
connection, while the SPA8000 and SPA8800 support one connection for each
pair of FXS ports (1/2, 3/4, 5/6, and 7/8) for a maximum of four connections.
Follow this procedure to optimize fax completion rates.
STEP 1 Upgrade the ATA firmware to the latest version
STEP 2 Ensure that you have enough bandwidth for uplink and downlink.
For G.711 fallback, it is recommend to have approximately 100Kbps.
For T.38, allocate at least 50 kbps.
STEP 3 To optimize G.711 fallback fax completion rates, set the following on the Line tab
of your ATA device:
Network Jitter Buffer: very high
Jitter buffer adjustment: disable
Call Waiting: no
3 Way Calling: no
Echo Canceller: no
Silence suppression: no
Preferred Codec: G.711
Use pref. codec only: yes
STEP 4 If you are using a Cisco media gateway for PSTN termination, disable T.38 (fax
relay) and enable fax using modem passthrough.
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