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This chapter describes how to place videoconference calls using the Cisco IP/VC 3520 Gateway. Topics covered include:
The Cisco IP/VC 3520 Gateway resides on the LAN and allows LAN users to hold videoconference calls with WAN users connected to BRI and V.35 lines. The gateway is one element used in LAN videoconferencing. The videoconferencing elements include:
Videoconference calls can be voice, video, or data format or a combination of formats. Each format has unique transmission requirements. These requirements take up a portion of the total network transmission capacity, and can affect the speed with which information travels from one point on the network to the next. Videoconference management stations give network administrators flexibility in managing the flow of traffic on the network. The stations allow the administrator to design call services based on the call-format transmission requirements. Call services make efficient use of network bandwidth.
The network administrator creates call services on the management stations that provide the service. Each service is assigned a dialing prefix. The caller uses the prefix to specify requirements for the call. This allows the system to determine whether the proper bandwidth is available to place the call.Table 7-1shows some services that can be created on the Cisco IP/VC 3520 Gateway.
| Service | Prefix | Description |
Voice call | 9 | For voice only calls over one B channel. |
Video call | 82 | For videoconferencing calls using 1B or 2B channels. |
V.35 384 kbps video call | 86 | For high bandwidth videoconferencing calls over V.35 ports. |
This section describes how LAN users can place calls to WAN terminals.
To place a call to a WAN terminal, dial the service prefix assigned for the type of call you want to make and the recipient phone number. The format for such a call is prefix phone_number.
Example 7-1 shows how the format is used.
A LAN user wants to place a voice call to a WAN terminal. The terminal phone number is 1 (800) 555-1212. The prefix for a voice call is 9. To place the call, the user dials 918005551212.
If you choose a service that uses a 2B phone line, you will need to have two unique phone numbers. Some videoconference terminals do not provide a place for you to enter both numbers for 2B calls. The Cisco IP/VC 3520 Gateway uses a delimiter to allow you to place 2B calls when your videoconference terminal does not make provisions for the second number.
To place a 2B call in a terminal that makes provisions for only one phone, perform the following steps:
Step 2 Dial the service prefix for a 1B videoconference call, the first phone number, the second number delimiter, and the second phone number.
Example 7-2 shows how to place a 2B call to one phone number.
A user wants to place a 2B call using a client interface that has provisions for only one phone number. The phone number the user wants to call is 1 (800) 555-1212. The 1B dialing prefix is 82. The Second Number Delimiter the gateway uses is *. To place the call, the user dials 828005551212*.
Example 7-3 shows how to place a 2B call to two phone numbers.
The phone numbers the user wants to call are 1 (800) 555-1212 and 555-1212. The 1B dialing prefix is 82. The Second Number Delimiter the gateway uses is *. To place the call, the user dials 828005551212*5551212.
Calls originating on WAN terminals to LAN endpoints can be direct dial or require routing assistance. How the call is placed depends on the configuration of the ISDN line connected to the gateway, how the videoconference environment is configured, and on how the gateway is configured. The Cisco IP/VC 3520 Gateway supports MSN and TCS4 for direct dial calls and IVR and Default Extension for calls that require dialing assistance. This section describes how to dial into the LAN using each of these routing methods.
MSN is a service provided by the telephone company that assigns multiple phone numbers to an ISDN trunk. The network administrator can use the numbers to give individual endpoint a unique phone number that can be dialed directly. If the gatekeeper is configured to use MSN, it passes calls containing an MSN phone number directly to the endpoint assigned the number. The network administrator sets up the endpoint to handle the call.
To place a call using an MSN phone number, perform the following steps:
Step 2 Dial the number as a regular call.
Example 7-4 shows how to dial a MSN phone number.
An endpoint on the LAN is assigned the MSN phone number
(800) 555-1212. To call the endpoint, dial 18005551212.
TCS4 is a special routing method for video calls the Cisco IP/VC 3520 Gateway supports that allows direct dialing. TCS4 allows the network administrator to assign a TCS4 extension to a LAN endpoint. When the extension is included in the dialing string, the call is routed to the endpoint.
To place a call using a TCS4 extension, perform the following steps:
a. From the network administrator obtain a number you can use to call the Cisco IP/VC 3520 Gateway.
b. From the network administrator obtain the TCS4 extension.
c. If required, obtain the delimiter your terminal requires to separate entries in the dialing string. Refer to the documentation of your terminal for delimiter information.
Step 2 Dial the gateway phone number, the delimiter if required, and the TCS4 extension.
Example 7-5 shows how to dial a number with a TCS4 extension.
An endpoint on the LAN is assigned the TCS4 extension 0000. The Cisco IP/VC 3520 Gateway phone number is (800) 555-1212. The dialing terminal requires that your use ~ for the delimiter. To call the endpoint, dial 18005551212~0000.
IVR is an automated answering system that directs your call to the destination you choose. When the Cisco IP/VC 3520 Gateway is configured to support IVR routing, you can use a keyboard or keypad to enter the call service information after it is requested.
IVR uses DTMF signals to register your response. Your terminal must support DTMF to use this feature. Refer to the documentation of your terminal to learn whether the terminal supports DTMF.
Using IVR to place a call on the LAN is a two part process. First, you dial the gateway to connect to the IVR operator. Second, you dial the videoconference-call service information after the IVR operator requests that information. Your call is routed to the appropriate party.
To place an IVR assisted call, perform the following steps:
a. From the network administrator obtain a Cisco IP/VC 3520 Gateway number.
b. From the network administrator obtain the service prefix and other LAN dialing information for your call as required.
Step 2 Dial the gateway phone number. The IVR operator picks up your call.
Step 3 After the IVR operator requests it, use the keyboard or a keypad to enter the call service information required for the call.
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Note If the endpoint you are calling resides in a different zone than the gatekeeper you are going through and zone prefixes are being used, you will need to include the zone prefix in the dial string for the service. |
The IVR operator acknowledges your entry, and the call is placed.
Example 7-6 shows how to dial the IVR service.
You want to participate in a videoconference call. The prefix assigned to the call is 18. The Cisco IP/VC 3520 Gateway IVR operator phone number is 555-1212. To place the call, dial 5551212. The IVR operator answers and asks for the number you want to dial and gives you dialing instruction. Dial 18 on a keyboard or keypad. The gateway connects you with the service.
The Default Extension is setup to handle calls coming into the Cisco IP/VC 3520 Gateway that are not direct dial or handled by IVR. The network administrator can assign an endpoint to handle these calls. The endpoint routes the call.
If the embedded gatekeeper in the Cisco IP/VC 3520 Gateway is enabled, the network administrator can configure the predefined gatekeeper services. The predefined services include:
This section describes how you can use the predefined services when they are enabled.
When the network administrator enables the Forward service, you can forward the following calls:
To forward a call to another endpoint or to a group hunting service, perform the following steps:
Step 2 Dial the forwarding prefix followed by the number of the endpoint or the group hunting service.
Example 7-7 shows how forward a call to a LAN number.
Forward a call to a local endpoint that has the number 5531. The forwarding prefix is *72. To forward the call, dial *725531. If the endpoint is in a remote zone with the zone prefix 0000, dial *7200005531
To forward a 1B or 2B to a WAN terminal, perform the following steps:
Step 2 Dial the forwarding prefix followed by the service prefix and the phone number. Be sure to include the second number delimiter, if required, and the second number on 2B calls.
Example 7-8 shows how to forward a call to a WAN terminal.
Forward a 2B video call to a WAN terminal that has the number
(800) 555-1212. The forwarding prefix is *72. The 2B video prefix is 82. The second number delimiter is ~. To forward the call, dial *728218005551212~
You can cancel a forward that you make. Follow this step to cancel the forwarded call.
Dial the forwarding prefix from the endpoint that you used to request the service.
Example 7-9 shows how to cancel a call you have forwarded.
Cancel a call forwarded to endpoint 5531. The forward prefix is *72. To cancel the call, dial *72.
The Forward on no-answer service triggers automatically and does not require user intervention. How your call is handled depends on how the network administrator sets up the service.
A gatekeeper and all of the endpoints that register with it constitute a zone. The gatekeeper handles all calls that originate inside the zone and all incoming calls to the zone. The network administrator can configure the zone to restrict inbound traffic by assigning the zone a zone prefix. Only calls that include the zone prefix in the dial string are allow to enter the zone.
If your LAN is using zone prefixes, remote users must perform the following steps to dial an endpoint in your (local) zone:
Step 2 Dial the zone prefix, the call service prefix, and the dialing number.
Example 7-10 shows how to dial in to your local zone from a remote zone using the zone prefix.
The network uses zone prefixes. Someone from a remote zone wants to place a voice call to your endpoint. The zone prefix enabled for your endpoint is 22. The voice call service is 13. Your dial number is 5531. To place the call, the remote user dials 22135531.
Posted: Mon Jun 5 12:33:06 PDT 2000
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