Cisco Small Business Pro SPA3102 Administration Manual page 58

Configuring Voice Services
Using a FAX Machine (SPA2102, SPA3102 or SPA8000)
STEP 3
STEP 4
STEP 5
STEP 6
ATA Administration Guide
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
If you are using a Cisco media gateway for PSTN termination, disable T.38 (fax
relay) and enable fax using modem passthrough.
For example:
modem passthrough nse payload-type 110 codec g711ulaw
fax rate disable
fax protocol pass-through g711ulaw
Enable T.38 fax on the SPA 2102 by configuring the following parameter on the
Line tab for the FXS port to which the FAX machine is connected:
FAX_Passthru_Method: ReINVITE
If a T.38 call cannot be set-up, then the call should automatically revert to
NOTE
G.711 fallback.
If you are using a Cisco media gateway use the following settings:
Make sure the Cisco gateway is correctly configured for T.38 with the SPA dial
peer. For example:
fax protocol T38
fax rate voice
fax-relay ecm disable
fax nsf 000000
no vad
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