164 3Com VCX V7111 VoIP SIP Gateway User ManualThree forms of forwarding parties are available:1 Served party – the party that is configured to forward the call – VCX V7111/FXS.2 Originating party – the party that initiated the first call – VCX V7111/FXS or FXO.3 Diverted party – the new destination of the forwarded call – VCX V7111/FXS or FXO.The served party (VCX V7111/FXS) can be configured through the Web browser (see CallForward on page 103) or via ini file to activate one of the call forward modes. These modesare configurable per gateway's endpoint.Note the following SIP issues: Initiating forward – When forward is initiated, the gateway sends a 302 response with acontact that contains the phone number from the forward table and its corresponding IPaddress from the routing table (or, when Proxy is used, the proxy’s IP address). Receiving forward – The gateway handles 3xx responses for redirecting calls with a newcontact.Call WaitingThe Call Waiting feature enables FXS gateways to accept an additional (second) call onbusy endpoints. If an incoming IP call is designated to a busy port, the called party hears callwaiting tone (several configurable short beeps) and (for Bellcore and ETSI Caller IDs) canview the Caller ID string of the incoming call. The calling party hears a Call Waiting RingbackTone. Called party can accept the new call, using hookflash, and can toggle between the twocalls.To enable Call Waiting: Set “EnableCallWaiting = 1”. Set “EnableHold = 1”. Define the Call Waiting indication and Call Waiting Ringback tones in the Call ProgressTones file. To configure the Call Waiting indication tone cadence, modify the following parameters:‘NumberOfWaitingIndications’, ‘WaitingBeepDuration’ and‘TimeBetweenWaitingIndications’. To configure a delay interval before a Call Waiting Indication is played to the currentlybusy port use the parameter ‘TimeBeforeWaitingIndication’. This enables the caller tohang up before disturbing the called party with Call Waiting Indications. Applicable onlyto FXS gateways.Both the calling and the called sides are supported by FXS gateways; the FXO gatewayssupport only the calling side.To indicate Call Waiting, the gateway sends a 182 - call queued response.The gateway identifies a Waiting Call when a 182 (call queued response) is received.Message Waiting IndicationSupport for Message Waiting Indication (MWI) according to IETF draft-ietf-sipping-mwi-04.txt, including SUBSCRIBE (to MWI server). VCX V7111/FXS gateways can accept anMWI Notify message that indicates waiting messages or that the MWI is cleared. Users are
