/mcpzip-zip (auto-answer) tone will play to the called party before the party can hear the voice of the caller. For intercom users to know whether the intercom is using one-way or two-way audio, the lamp for both intercom buttons appears colored amber for a one-way whisper Intercom and green for two-way audio. For TSP applications, only one RTP event occurs for the monitored party: either the intercom originator or the intercom destination, with the call state as whisper, in the case of a one-way whisper intercom. TSP exposes the Intercom line indication and Intercom Speed Dial information in DevSpecific of LineDevCap. The application can retrieve the information by issuing LineGetDevCaps. In the DevSpecific portion, TSP provides information that indicates (DevSpecificFlag = LINEDEVCAPSDEVSPECIFIC_INTERCOMDN) whether this is the Intercom line. You can retrieve the Intercom speed dial information in the DevSpecific portion after the partition field. If a CTI port is used for the Intercom, the application should open the CTI port with dynamic media termination. TSP returns LINEERR_OPERATIONUNAVAIL if the Intercom line is opened with static media termination. You cannot use CTI Route Point for the Intercom feature. Note The administrator can configure the speed dial and label options from Unified Communications Manager Administration. However, the application can issue CciscoLineSetIntercomSpeeddial with SLDST_LINE_SET_INTERCOM_SPEEDDIAL to set or reset SpeedDial and Label for the intercom line. The Application setting will overwrite the administrator setting that is configured in the database. Unified Communications Manager uses the application setting to make the intercom call until the line is closed or until the application resets it. In the case of a Communications Manager or CTIManager failover, CTIManager or Cisco TSP resets the speed dial setting of the previous application. If the application restarts, the application must reset the speed dial setting; otherwise, Unified Communications Manager will use the database setting to make the intercom call. In any case, if resetting of the speed dial or label fails, the system sends a LINE_DEVSPECIFIC event to indicate the failure. When the application wants to release the application setting and have the speed dial setting revert to the database setting, the application can call CciscoLineSetIntercomSpeeddial with a NULL value for SpeedDial and Label. If the speed dial setting is changed, whether due to a change in the database or because the application overwrites the setting, the system generates a LineDevSpecific event to indicate the change. However, the application needs to call CCiscoLineDevSpecificSetStatusMsgs with DEVSPECIFIC_SPEEDDIAL_CHANGED to receive this notification. After receiving the notification, the application can call LineGetDevCaps to find out the current settings of speed dial and label. Users can initiate an intercom call by pressing the Intercom button at the originator or by issuing a LineMakeCall with a NULL destination if Speedial/Label is configured on the intercom line. Otherwise, LineMakeCall should have a valid Intercom DN. For an intercom call, a CallAttribute field in LINECALLINFODEVSPECIFIC indicates whether the call is for the intercom originator or the intercom target. After the intercom call is established, the system sends a zip-zip tone event to the application as a tone-changed event. Users can invoke a TalkBack at the destination in two ways: • By pressing the intercom button • By issuing CciscoLineIntercomTalkback with SLDST_LINE _INTERCOM_TALKBACK Cisco Unified TAPI Developers Guide for Cisco Unified Communications Manager, Release 15 and SUs 72 Features Supported by TSP Intercom