Name: Cisco ATA 191
Brand: Cisco
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CHAPTER 9

Advanced Options for Phone Services

•

Optimize Fax Completion Rates, page 125

•

Dial Plan Configuration, page 127

Optimize Fax Completion Rates

Issues can occur with fax transmissions over IP networks, even with the T.38 standard. Use the following

task to help avoid any issues.

Procedure

Step 1

Ensure that you have enough bandwidth for the uplink and the downlink.

•

For G.711 fallback, we recommend approximately 100 kbps.

•

For T.38, allocate at least 50 kbps.

Step 2

Click Voice in the menu bar, and then click Line 1 or Line 2 in the navigation tree.

Step 3

In the Network Settings section, enter the following settings:

• Network Jitter Level—very high.

• Jitter Buffer Adjustment—no.

Step 4

In the Supplementary Service Subscription section, enter the following settings:

• Call Waiting Serv—no.

• Three Way Call Serv—no.

Step 5

In the Audio Configuration section, enter the following settings to support T.38 fax:

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

• Use pref. codec only—Yes.

• Silence Supp Enable—No.

Cisco ATA 191 and ATA 192 Analog Telephone Adapter Administration Guide for Multiplatform Firmware

125

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