MediaPack SIP
MediaPack SIP User’s Manual 92 Document #: LTRT-65405
many coder payloads are combined into one RTP (voice) packet.
Note 1: The ptime packetization period depends on the selected coder name.
Note 2: If not specified, the ptime gets a default value.
Note 3: The ptime specifies the maximum packetization time the gateway can receive.
5. Repeat steps 3 and 4 for the second to fifth coders (optional).
6. Repeat steps 2 to 5 for the second to forth coder groups (optional).
7. Click the Submit button to save your changes.
8. To save the changes so they are available after a power fail, refer to Section
5.9 on page
161.
Note: In the current version, only the ptime of the first coder is sent in the SDP
section of the INVITE message.
Table 5-15: ini File Coder Group Parameters
Parameter Description
CoderName_ID
Coder list for Profiles (up to five coders in each group).
The CoderName_ID parameter (ID from 1 to 4) provides groups of coders that can be
associated with IP or Tel profiles.
You can select the following coders:
g711Alaw64k – G.711 A-law.
g711Ulaw64k – G.711 µ-law.
g7231 – G.723.1 6.3 kbps (default).
g7231r53 – G.723.1 5.3 kbps.
g726 – G.726 ADPCM 32 kbps (Payload Type = 2).
g729 – G.729A.
g729_AnnexB – G.729 Annex B.
The RTP packetization period (ptime, in msec) depends on the selected Coder name,
and can have the following values:
G.711 family – 10, 20, 30, 40, 50, 60, 80, 100, 120 (default=20).
G.729 family – 10, 20, 30, 40, 50, 60 (default=20).
G.723 family – 30, 60, 90 (default = 30).
G.726 family – 10, 20, 30, 40, 50, 60, 80, 100, 120 (default=20)
Note: If the coder G.729 is selected, the gateway includes ‘annexb=no’ in the SDP of the
relevant SIP messages. If G.729 Annex B is selected, ‘annexb=yes’ is included. An
exception to this logic is when the remote gateway is a Cisco device (IsCiscoSCEMode).
ini file note 1: This parameter (CoderName_ID) can appear up to 20 times (five coders
in four coder groups).
ini file note 2: The coder name is case-sensitive.
ini file note 3: Enter in the format: Coder,ptime.
For example, the following three coders belong to coder group with ID=1:
CoderName_1 = g711Alaw64k,20
CoderName_1 = g711Ulaw64k,40
CoderName_1 = g7231,90
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