Specifications

Chapter 5 - NCS Protocol Features Encoding Name of the Payload Type 18
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Mediatrix 4100
3. Restart the Mediatrix 4100 so that the changes may take effect.
Encoding Name of the Payload Type 18
For NCS compatibility, the Mediatrix 4100 allows you to choose the literal name of the compression algorithm
defined by the RTP Payload Type 18. If the Call Agent and the Mediatrix 4100 do not use the same encoding
name, this may result in no voice being transmitted.
This feature is currently located under the mediatrixExperimental branch of the MIB structure. See “MIB
Structure” on page 33 for more details.
 To set the encoding name of the RTP Payload Type 18:
1. In the ncsCompatibilityMIB, under mediatrixExperimental, locate the ncsCompatibilityMIBObjects
group.
2. Set the ncsCompatibilityRtpPayloadType18EncodingName variable.
This variable defines the literal name of the compression algorithm corresponding to the RTP
payload type 18. You have the following choices:
• g729
• g729A
3. Restart the Mediatrix 4100 so that the changes may take effect.
ncsLinePackageSlDuration Stutter dial tone timeout value in ms. It notifies the user that
they have a voice mail message when the phone does not or
cannot have a message-waiting light.
Default Value: 16000
ncsLinePackageTCritical
Duration
Interdigit timeout value in ms when a timer is all that is
required for the digit string to match a pattern in the digit map.
Default Value: 4000
ncsLinePackageTPartial
Duration
Interdigit timeout value in ms when at least one more digit is
required for the digit string to match any of the patterns in the
digit map.
Default Value: 16000
Table 71: NCS Line Package Information (Continued)
Variable Description
RTP Payload Type 18
The payload type "18" identifies the codec G729 (or G729A) in RTP packets. This number is defined by
the IANA (Internet Assigned Numbers Authority).
Impacts of Encoding Name
In NCS, the encoding name used for the RTP payload type 18 has an impact on the following :
• The literal name of the compression algorithm in the "Local Connection Options" sent in a
NCS command.
Example of local connection options is:
L: a:G729, e:on
• The literal name of the compressions algorithm in the "Capabilities" send in a NCS answer.
Example of the capabilities is:
A: a:G729, p:10-40, t:0, v:L, m:sendonly;recvonly;sendrecv;inactive