Cisco SPA112 Administration Guide

Advanced Options for Voice Services
Optimizing Fax Completion Rates
Administration Guide 137
9
• 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.

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