Operation Manual

Cisco SPA100 Series Administration Guide 136

Advanced Options for Voice Services

This appendix provides additional information about configuring advanced options for voice

services.

STEP 1

• Optimizing Fax Completion Rates

• Configuring Dial Plans

Optimizing Fax Completion Rates

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

is supported by the ATA. You can adjust several settings on your ATA to optimize your fax

completion rates.

STEP 1 Ensure that you have enough bandwidth for the uplink and the downlink.

• For G.711 fallback, it is recommend to have 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: