Hanlong Technology Co., Ltd Unicorn 60x0 User Manual Page 17 of 25
Firmware
1.0.0.29 Last Updated 8/2010
Proxy-Require
SIP Extension to notify SIP server that the unit is behind the
NAT/Firewall.
USE NAT IP
NAT IP address used in SIP/SDP message. Default is
blank.
Preferred Vocoder
The Unicorn600x supports up to 5 different Vocoder types
including G.711 A-/U-law, G.726 (Supports bit rates 32K),
G.723.1, G.729A/B. The user can configure Vocoders in a
preference list that will be included with the same
preference order in SDP message. The first Vocoder is
entered by choosing the appropriate option in “Choice 1”.
The last Vocoder is entered by choosing the appropriate
option in “Choice 6”.
Voice Frames per TX
This field contains the number of voice frames to be
transmitted in a single packet. When setting this value, the
user should be aware of the requested packet time (used in
SDP message) as a result of configuring this parameter.
This parameter is associated with the first vocoder in the
above vocoder Preference List or the actual used payload
type negotiated between the 2 conversation parties at run
time. e.g., if the first vocoder is configured as G723 and the
“Voice Frames per TX” is set to be 2, then the “ptime” value
in the SDP message of an INVITE request will be 60ms
because each G723 voice frame contains 30ms of audio.
Similarly, if this field is set to be 2 and if the first vocoder
chosen is G729 or G711 or G726, then the “ptime” value in
the SDP message of an INVITE request will be 20ms. If the
configured voice frames per TX exceeds the maximum
allowed value, the Unicorn 600x will use and save the
maximum allowed value for the corresponding first vocoder
choice. The maximum value for PCM is 10(x10ms) frames;
for G726, it is 20 (x10ms) frames; for G723, it is 32 (x30ms)
frames; for G729/G728, 64 (x10ms) and 64 (x2.5ms) frames
