Manual Cisco Cisco SPA112 VoIP (page 126 of 136) (English)

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Advanced Options for Voice Services

Optimizing Fax Completion Rates

Administration Guide 137

• Preferred Codec: G.711u (USA) or G.711a (rest of the world)

• Use pref. codec only: yes

• Silence Supp Enable: no

• Echo Canc Enable: no

• FAX Passthru Method: ReINVITE

STEP 6 Click Submit to save your settings or click Cancel to abandon the unsaved settings.

STEP 7 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

Note: If a T.38 call cannot be set-up, then the call automatically reverts to G.711 fallback.

STEP 8 If you are using a Cisco media gateway, make sure the Cisco gateway is correctly configured

for T.38 with the dial peer. For example:

fax protocol T38

fax rate voice

fax-relay ecm disable

fax nsf 000000

no vad

Fax Troubleshooting

If you have problems sending or receiving faxes, complete the following steps:

STEP 1 Verify that your fax machine is set to a speed between 7200 and 14400.

STEP 2 Send a test fax in a controlled environment between two ATAs.

STEP 3 Determine the success rate.

STEP 4 Monitor the network and record the statistics for jitter, loss, and delay.

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Cisco Cisco SPA112 VoIP Manual

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