Cisco SPA112 Administration Guide

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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:

Cisco SPA112 Specifications

General

Supported network protocols	IPv4, IPv6, ARP, DNS, SRV, DHCP, PPPoE, ICMP, TCP, UDP, RTP, RTCP, SNTP
DHCP client	Yes
VPN support	802.1p
Security algorithms	SSL/TLS
Authentication method	SIP
Modem (RJ-11) ports	2
Ethernet LAN (RJ-45) ports	1
Voice codecs	G.711, G.726, G.729
Certification	FCC, CE, ICES, A-Tick, RoHS, UL
Fax compatibility	T.38
Output current	2 A
Output voltage	5 V
AC input voltage	100-240 V
AC input frequency	50 - 60 Hz
Storage temperature (T-T)	-25 - 70 °C
Operating temperature (T-T)	0 - 45 °C
Operating relative humidity (H-H)	10 - 90 %

Weight and Dimensions

Width	101 mm
Height	28 mm
Weight	153 g