Vocoder Information

Overview (IMG 1010):

The IMG 1010 has two DSP chips which provide enough capability to handle all announcements, all call progress tones, and all call setup tones needed to perform Dialogic's call load performance tests. Each codec uses a different amount of resources from the resource pool in the IMG 1010. Below are a few tables displaying the codecs supported, the profiles supported for each codec, and the amount of resources available for each profile.

 

Overview (IMG 1004):

The IMG 1004 has a single DSP chip which provides enough capability to handle all announcements, all call progress tones, and all call setup tones needed to perform Dialogic's call load performance tests. Each codec uses a different amount of resources from the resource pool in the IMG 1004. Below are a tables displaying the codecs supported, the profiles that are supported for each codec, and the amount of resources available for each profile.

 

 

VoIP Resource Profiles:

Table 1: Codecs supported by Profile number

Codec

Profile 5

Profile 6

Profile 7

G.711 alaw

Yes

Yes

Yes

G.711 ulaw

Yes

Yes

Yes

G.723 5.3 kbps

Yes

Yes

Yes

G.723 6.3 kbps

Yes

Yes

Yes

G.729

Yes

Yes

Yes

G.729E

Not Supported

Yes

Yes

iLBC 20 ms

Not Supported

Yes

Yes

iLBC 30 ms

Not Supported

Yes

Yes

AMR

Not Supported

Not Supported

Yes

EVRC

Not Supported

Not Supported

Yes

GSM - FR Static

Not Supported

Yes

Yes

GSM - FR Dynamic

Not Supported

Yes

Yes

G.726-32/G.721 Static

Yes

Yes

Yes

G.726-32/G.721 Dynamic

Yes

Yes

Yes

 

 

Table 2: Resources supported by Profile Number

IMG 1010 Resources Supported by Profile Number (4 Chip Module Installed)

Profile Number

Resources Supported

Channels per DSP

Channels per Module

PROFILE 5

512 Resources

128

512

PROFILE 6

336 Resources

84

336

PROFILE 7

336 Resources

84

336

 

IMG 1010 Resources supported by Profile Number (2 Chip VoIP Module Installed)

Profile Number

Resources Supported

Channels per DSP

Channels per Module

PROFILE 5

256 Resources

128

256

PROFILE 6

168 Resources

84

168

PROFILE 7

168 Resources

84

168

 

IMG 1004 Resources Supported by Profile Number

Profile Number

Resources Supported

Channels per DSP

PROFILE 5

128 Resources

128

PROFILE 6

84 Resources

84

PROFILE 7

84 Resources

84

 

 

Profile #

VoIP Module Resources (SRTP Enabled)

VoIP Module Resources (SRTP Disabled)

Profile 5

336 Resources

512 Resources

Profile 6

288 Resources

336 Resources

Profile 7

288 Resources

336 Resources

 

Codec Payload Size:

The table below includes information on the payload sizes in milliseconds of the codecs supported by the IMG. The payload size can be changed in ClientView in increments of 10 ms.

 

For example:

G.723 5.3 kbps codec can have the payload size of 10,20,30,40,50, or 60

 

Table 3: Codecs supported and Min/Max/Preferred payload sizes

 

Payload Type/Codec

Preferred Payload Size

Minimum Payload Size

Maximum Payload Size

AMR (SIP ONLY)

20 ms

20 ms

20 ms

EVRC (SIP ONLY)

20 ms

20 ms

20 ms

G.711 alaw

20 ms

10 ms

30 ms

G.711 ulaw

20 ms

10 ms

30 ms

G.723 5.3 kbps

30 ms

30 ms

90 ms

G.723 6.3 kbps

30 ms

30 ms

90 ms

G.729

20 ms

10 ms

60 ms

G.729E/G (SIP ONLY)(10.3.2 ER2 and above)

20 ms

10 ms

30 ms

iLBC 20 ms

20 ms

20 ms

20 ms

iLBC 30 ms

30 ms

30 ms

30 ms

GSM-FR Static Payload Type

20 ms

20 ms

60 ms

GSM-FR Dynamic Payload Type

20 ms

20 ms

60 ms

G.726-32/G.721 Static Payload Type

20 ms

10 ms

60 ms

G.726-32/G.721 Dynamic Payload Type

20 ms

10 ms

60 ms

 

 

Vocoder Host Flag:

The host flag in the dhcpd.conf file located in /etc must be given a numerical value. This value is calculated by using certain attributes such as T1/E1, SD Card/FTP Server and Codecs being used. See the following links below as to how to calculate the correct hostflag value for your particular network.

See:

Setting Host Flags

Editing the DHCP Conf File

 

 

Limitations:

An IMG which is populated with Mindspeed VoIP modules does not support tone detection for any wireless codecs including the following:

 

AMR

EVRC

GSM-FR

GSM-EFR

 

However, it is possible that an IMG with Mindspeed VoIP Module could pass a fax using wireless codecs to a Remote Gateway. In order for this to work, the Remote entity must send the IMG something to trigger it to switch to fax. Some examples would be: