Cisco IE-3000-8TC Administration Guide - Page 315

Connection Settings Settings Line Usage Description There are two main Line Usage options: • All Call Types-The PSTN connection may be used for any incoming and outgoing calls to the PSTN. If you are using the All Call Types, you should have a directory number, translation, or hunt pilot set up to receive inbound calls on that DID. • Emergency Calls Only-The outbound PSTN connection is only used for calls to designated emergency service numbers that have been identified by the country chosen during First Time Setup or to alternate emergency service numbers as defined on the site page. If this PSTN connection is selected as Emergency Calls Only, the DID Number for the PSTN connection will be configured as an Emergency Locator ID Number (ELIN) if not previously configured. If you remove ELIN from a site, the setting reverts back to the All Call Types option. Conversely, if an Emergency Calls Only trunk is converted to All Call Types, ELIN is removed from that site. Inbound calls from the PSTN to PSTN connections designated as Emergency Calls Only should only be call-backs on emergency calls. The DID cannot be used for non-emergency calls. To do so could prevent emergency calls from going out, given that the analog line only allows one call at a time. Advanced Parameters PSTN Disconnect Detection Note The pick-up timer in Cisco Unified Business Edition 3000 has been set to delay picking up incoming calls by 4 seconds. To pick up all incoming calls, ensure that all of the disconnect timers mentioned below are set to disconnect a call only after a silence of 5 seconds. Detect CPC CPC, or Calling Party Control, is a brief removal of tip-and-ring voltage to indicate the disconnection of a party from the call. If enabled, the SPA disconnects both call legs when this signal is detected. Detect Polarity Reversal If enabled, the SPA8800 disconnects both call legs when a polarity reversal occurs. On calls originating from the PSTN, the first polarity reversal is ignored and the second one triggers the disconnect. For all other calls across the SPA, the first polarity reversal triggers the disconnect. Detect PSTN Long Silence If enabled, the SPA8800 disconnects both call legs when the PSTN side has no voice activity for a duration longer than the length specified in the PSTN Long Silence Duration parameter during a call across the connection. OL-27022-01 Administration Guide for Cisco Business Edition 3000, Release 8.6(4) 295