echoCancellationType

This data informs which echo cancellation algorithm to
be used by default: 165 or 168 for a particular
channel. The numbers 165 and 168 are the ITU 
designations for the algorithms. The number following
the designation describes the echo tail length in
milliseconds.
          
Both G.165 and G.168 are ITU-T recommendations. G.168
has slightly stricter technical specs. G.168 defines
much better how the tests are performed. If an echo
canceller passes the G.165 spec, then it is G.165
compliant. If it passes G.168, it is both G.168 and
G.165 compliant.
          
The echo tail length required depends on factors such
as network configuration, local loop length, line 
frequency response, etc. Generally, 16 ms is more than
adequate for local loop (ie. Zedge) and 32 ms is a
good minimum for Network side. Our products currently
support up to 48 ms of echo tail length, MALC supports
16 ms of echo tail length.
          
Valid values for the variable are:
          
* off - echo cancellation is off (on all platforms).
* g165EchoTL16 - G.165 echo cancellation with echo
  tail length of 16ms (on MALC only).
* g168EchoTL48 - G.168 echo cancellation with echo
  tail length of 48ms (on the other platforms, i.e.:
  BAN, Sechtor 100, Z-Edge64).
          
          
Following values are not supported:
          
* g165EchoTL32 - G.165 echo cancellation with echo
  tail length of 32ms.
* g165EchoTL48 - G.165 echo cancellation with echo
  tail length of 48ms.
* g168EchoTL32 - G.168 echo cancellation with echo
  tail length of 32ms.
* g168EchoTL64 - G.168 echo cancellation with echo
  tail length of 64ms.
* g168EchoTL80 - G.168 echo cancellation with echo
  tail length of 80ms.
* g168EchoTL96 - G.168 echo cancellation with echo
  tail length of 96ms.
* g168EchoTL112 - G.168 echo cancellation with echo
  tail length of 112ms.
* g168EchoTL128 - G.168 echo cancellation with echo
  tail length of 128ms.
          
The default value is g165EchoTL16 for MALC, and 
g168EchoTL48 for the other platforms.

MIB

ZHONE-COM-VOICE-DSP-MIB

OID

.1.3.6.1.4.1.5504.4.3.3.1.6

Type

scalar

Access

readwrite

Status

current

Parent

voiceDspDefaultConfiguration