AudioCodes E-SBC

CHAPTER23 Digital PSTN
Mediant 1000 Gateway & E-SBC | User's Manual
Parameter Description
■ [1] PI = 1 = The PI value is sent to PSTN in
Q.931/Proceeding and Alerting messages. Typically, the
PSTN/PBX cuts through the audio channel without playing
local ringback tone, enabling the originating party to hear
remote Call Progress Tones or network announcements.
■ [2] PI = 2 = The PI value is sent to PSTN in
Q.931/Proceeding and Alerting messages. The destination
address is non-ISDN.
■ [8] PI = 8 = The PI value is sent to PSTN in
Q.931/Proceeding and Alerting messages. Typically, the
PSTN/PBX cuts through the audio channel without playing
local ringback tone, enabling the originating party to hear
remote Call Progress Tones or network announcements.
'Select Receiving of Overlap
Receiving'
configure voip >
interface e1-t1|bri >
ovrlp-rcving-type
[ISDNRxOverlap]
Determines the receiving (Rx) type of ISDN overlap dialing for
Tel-to-IP calls, per trunk.
■ [0] None = (Default) Disabled.
■ [1] Local receiving = ISDN Overlap Dialing - the
complete number is sent in the INVITE Request-URI user
part. The device receives ISDN called number that is sent
in the 'Overlap' mode. The ISDN Setup message is sent to
IP only after the number (including the Sending Complete
IE) is fully received (via Setup and/or subsequent Info
Q.931 messages). In other words, the device waits until it
has received all the ISDN signaling messages containing
parts of the called number, and only then it sends a SIP
INVITE with the entire called number in the Request-URI.
■ [2] Through SIP = Interworking of ISDN Overlap Dialing
to SIP according to RFC 3578. The device sends the first
received digits from the ISDN Setup message to the IP
side in the initial INVITE message. For each subsequently
received ISDN Info Q.931 message, the device sends the
collected digits to the IP side in re-INVITE messages.
■ [3] Through SIP INFO = Interworking of ISDN Overlap
Dialing to SIP according to RFC 3578. The device sends
the first received digits from the ISDN Setup message to
the IP side in the initial INVITE message. For each
subsequently received ISDN Info Q.931 message, the
device sends the collected digits to the IP side in INFO
messages.
Note:
■ When configured to Through SIP or Through SIP INFO,
you can define the minimum number of overlap digits to
collect before sending the first SIP message for routing the
call, using the MinOverlapDigitsForRouting parameter.
■ When configured to Through SIP or Through SIP INFO,
even if SIP 4xx responses are received during this ISDN
overlap receiving, the device does not release the call.
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