Accept Redirect to Blank User Destination

The following table represents the way in which this field works.

Always Use re-INVITE for Display Updates

The system displays this field when the Group Type field is SIP.

Resend Display UPDATE Once on Receipt of 481 Response

The value in the Resend Display UPDATE Once on Receipt of 481 Response field determines whether Communication Manager should resend display update message on receiving 481 response to Session Manager, instead of dropping the call immediately.

When Communication Manager receives 481 as a response for display update message from Session Manager (only when the display update message is sent after the first non 100 response), then Communication Manager resends display update message to Session Manager.

If Session Manager responds with 481 again, then Communication Manager drops the call. This field does not apply to all other update messages except display update message.

Block Sending Calling Party Location in INVITE

Based on the , Communication field value, Manager selects the IP address that must be included in the Via header in an outgoing call. The system displays this field if the value of the Group Type field in the trunk group screen is SIP.

Build Refer-To URI of REFER From Contact For NCR

The system displays this field only for SIP trunk groups for which Network Call Redirection is enabled. Communication Manager uses the REFER message during a call transfer.

Convert 180 to 183 for Early Media

It is used for early media and direct media cut-through. When SDP answer is returned by Communication Manager in 18x messages, some entities have a problem receiving the SDP in a 180 Ringing message. If the Convert 180 to 183 for Early Media field is set to y, Communication Manager puts the SDP into a 183 Session Progress message. The default value is n.

Enable Q-SIP

The system displays Enable Q-SIP, only when the Group Type field is sip.

Identity for Calling Party Display

The system displays this field, when the Group Type field is sip.

This field determines which header to retrieve display information for the calling party when both the From and P-Asserted-Identity headers are available.

Interworking of ISDN Clearing with In-Band Tones

The setting of this field is for call-clearing of the tandem calls in which the incoming trunk to Communication Manager is a SIP trunk and the outgoing trunk from Communication Manager is an ISDN trunk. The far end at the ISDN PRI trunk ends the call.

If you select the keep-channel-active option, Communication Manager keeps the call active so that the caller can hear an in-band tone or announcement played over the ISDN trunk.

If you select the drop-with-sip-error option, Communication Manager detects the cause of call clearing, maps ISDN Cause Value to a SIP error response message, and sends the response message to the caller. With the drop-with-sip-error option, an adjunct placing outgoing calls is informed that the call has ended and the user can disconnect the call immediately instead of waiting for the ISDN network to end the call after the tone or announcement is complete.

Mark Users as Phone

Enables or disables the encoding of URIs in call control signaling messages originated at the gateway with the user=phone parameter. No subscription messages are encoded with the user=phone parameter, even when the field is set to y. Default is n.

Network Call Redirection

If enabled, Network Call Redirection (NCR) service is signaled over this trunk group. NCR only works on trunk groups connected to Service Providers that support NCR.

Prepend '+' to Calling/Alerting/Diverting/Connected Number

The system displays this field only for SIP trunk groups.

If you set this field to y, when a call is routed over a trunk group, Communication Manager inserts a leading plus (+) sign, if absent, in outgoing calling, alerting, diverting, or connected numbers. The default value is n.

To prevent Communication Manager from inserting a leading plus (+) sign in the calling number when a call is routed from Communication Manager to Session Manager, set the Numbering Format field to private and the Prepend '+' to Calling/Alerting/Diverting/Connected Number field to n.

QSIG Reference Trunk Group

The system displays this when the Group Type field is sip, and the Enable Q-SIP is set to y.

Request URI Contents

Send Diversion Header

This field is available only when the Service Type field is set to public-ntwrk. If you enable the Send Diversion Header field, the SIP diversion header is sent on the public SIP trunks. This header allows service providers to use the ten-digit number of the forwarding party for functions such as billing. Customers can administratively enable or disable the use of the SIP diversion header on any public SIP trunk. The default value is n.

Send Transferring Party Information

Enables or disables sending the transferring party information on a transferred call. Default is disabled.

Support Request History

You can activate the Support Request History field for a SIP trunk to capture the request location that was sent to a proxy. This information is used to send diversion information and notify the origin of the call to the far end equipment. If this field is disabled, History-Info header is not included in any requests.

Telephone Event Payload Type