Cisco Systems SPA8000, SPA2102, SPA3102, WRP400, PAP2T manual FAXPassthruMethod ReINVITE

Configuring Voice Services	4
Using a FAX Machine (SPA2102, SPA3102 or SPA8000)

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.

For example:

modem passthrough nse payload-type 110 codec g711ulaw fax rate disable

fax protocol pass-through g711ulaw

STEP 5 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

NOTE If a T.38 call cannot be set-up, then the call should automatically revert to

G.711 fallback.

STEP 6 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

ATA Administration Guide 56