![SS Telecoms SS-16 User Manual Download Page 49](http://html.mh-extra.com/html/ss-telecoms/ss-16/ss-16_user-manual_1354339049.webp)
SS-16 VoIP-2-GSM USER MANUAL
DOC. NO: SS-16-14 (REV. 02)
Page 49 of 84
Codec priority
SS-16 VOIP-2-GSM supports several
audio codecs, currently G.711 (both A-law
and u-law), 723 and 729. There are four
boxes, with decreasing priorities, from 1
down to 4. For each one, one may assign
a codec, or select “none”. Generally one
should enter the codec G.711 on the first
place, either with A-Law for Europe or u-
law for North America, followed by G.729.
G.711 provides good voice quality and
works well with in-band DTMF.
If the IP-PBX or the SIP-telephones that will be connected with SS-16 VOIP-2-GSM make
use of different codecs, one should set the “Codec Propriety” field accordingly.
RTP Packet Length
It lets you establish the value for packetization time (in
milliseconds) for each codec. It is usually set to 20, but it
may be as long as 30 msec or as short as 5 msec.
Increasing the packetization time reduces the
packetization overhead, but increases the latency.
Voice VAD
Enables or disables the "Voice Activity Detection", by
default this feature is disabled.