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Cisco ATA 192 Administration Guide

Cisco ATA 192
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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 Levelvery high.
Jitter Buffer Adjustmentno.
Step 4
In the Supplementary Service Subscription section, enter the following settings:
Call Waiting Servno.
Three Way Call Servno.
Step 5
In the Audio Configuration section, enter the following settings to support T.38 fax:
Preferred CodecG.711u (USA) or G.711a (rest of the world).
Use pref. codec onlyYes.
Silence Supp EnableNo.
Cisco ATA 191 and ATA 192 Analog Telephone Adapter Administration Guide for Multiplatform Firmware
125

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Cisco ATA 192 Specifications

General IconGeneral
Ports2 FXS ports
Network Interface10/100 Ethernet
Voice ProtocolSIP
Audio CodecsG.711, G.726, G.729
Operating Temperature0 to 40°C (32 to 104°F)
Storage Temperature-20 to 60°C (-4 to 140°F)
Humidity10 to 90% non-condensing
ComplianceFCC, CE, UL
Fax SupportT.38, G.711 pass-through

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