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In addition to the Message Translation Usage Overview, the following article contains a listing of the pre-programmed Message Translations on the SBC Edge.

For SIP to TDM calls, the first Progress/183 or Alert/180 response sent on the SIP side always contains an SDP; as a result, any inband audio is cut through or ringback is generated. Even if the Message Translation Table is configured to not include SDP, this process overrides the configuration.

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Internal Translations ISDN to SIP

Listed are the default (internal) message translations for ISDN → SIP:

#

Incoming ISDN side

Outgoing SIP side

How the SBC Edge Internally Processes the Translation

1

Alert without PI

180 with SDP

Incoming Filter

Early Media Status

IN Message

IN IE Type

IN Progress Indicator

Any

Alert

PI

Not Present

Outgoing Translation

OUT Message

Send Message

OUT IE

Media Cut Through

Alert

Yes

Not Present

Yes

2

Alert with PI 1, 8, 2

180 Ringing; if early media negotiated, don't include SDP

Incoming Filter

Early Media Status

IN Message

IN IE Type

IN Progress Indicator

Early media negotiated

Alert

PI

1 | 8 | 2

Outgoing Translation

OUT Message

Send Message

OUT IE

Media Cut Through

Alert

Yes

Not Present

Yes

3

Alert with PI 1, 8, 2

180 Ringing; if early media not negotiated, include SDP

Incoming Filter

Early Media Status

IN Message

IN IE Type

IN Progress Indicator

Early media not negotiated

Alert

PI

1 | 8 | 2

Outgoing Translation

OUT Message

Send Message

OUT IE

Media Cut Through

Alert

Yes

Present

Yes

4

Progress with PI 1, 8, 2

183 Progress; if early media negotiated, don't include SDP

Incoming Filter

Early Media Status

IN Message

IN IE Type

IN Progress Indicator

Early media negotiated

Progress

PI

1 | 8 | 2

Outgoing Translation

OUT Message

Send Message

OUT IE

Media Cut Through

Progress

Yes

Not Present

Yes

5

Progress with PI 1, 8, 2

183 Progress; if early media not negotiated, include SDP

Incoming Filter

Early Media Status

IN Message

IN IE Type

IN Progress Indicator

Early media not negotiated

Progress

PI

1 | 8 | 2

Outgoing Translation

OUT Message

Send Message

OUT IE

Media Cut Through

Progress

Yes

Present

Yes

6

Progress with PI 3, 4

183 Progress without SDP

Incoming Filter

Early Media Status

IN Message

IN IE Type

IN Progress Indicator

Any

Progress

PI

3 | 4

Outgoing Translation

OUT Message

Send Message

OUT IE

Media Cut Through

Progress

Yes

Not Present

Yes

7

Progress without PI

Drop message

Incoming Filter

Early Media Status

IN Message

IN IE Type

IN Progress Indicator

Any

Progress

PI

Not Present

Outgoing Translation

OUT Message

Send Message

OUT IE

Media Cut Through

Progress

No

N/A

N/A

Please note that ISDN → SIP message translations are only used on SIP → ISDN calls.

Internal Translations SIP to ISDN

Listed are the default (internal) message translations for SIP → ISDN:

#

Incoming SIP side

Outgoing ISDN side

How the SBC Edge Internally Processes the Translation

1

180 Ringing without SDP

Alerting without PI

Incoming Filter

Early Media Status

IN Message

IN IE Type

IN Progress Indicator

Any

Alert

PI

Not Present

Outgoing Translation

OUT Message

Send Message

OUT IE

Media Cut Through

Alert

No on cut through

Not Present

Yes On Early Media Detection

2

180 Ringing with SDP

Alerting with PI = 8

Incoming Filter

Early Media Status

IN Message

IN IE Type

IN Progress Indicator

Any

Alert

PI

Present

Outgoing Translation

OUT Message

Send Message

OUT IE

Media Cut Through

Alert

No on cut through

PI=8

Yes On Early Media Detection

3

183 Progress without SDP

Progress with PI = 1

Incoming Filter

Early Media Status

IN Message

IN IE Type

IN Progress Indicator

Any

Progress

PI

Not Present

Outgoing Translation

OUT Message

Send Message

OUT IE

Media Cut Through

Progress

No on subsequent

PI=1

Yes On Early Media Detection

4

183 Progress SDP

Progress with PI = 8

Incoming Filter

Early Media Status

IN Message

IN IE Type

IN Progress Indicator

Any

Progress

PI

Present

Outgoing Translation

OUT Message

Send Message

OUT IE

Media Cut Through

Progress

No on subsequent

PI=8

Yes On Early Media Detection

Please note that SIP → ISDN message translations are only used on ISDN → SIP calls.