Vì lý do này, groundstart tín hiệu thường được sử dụng trên các đường trung kế giữa các PBX và trong doanh nghiệp, nơi khối lượng cuộc gọi trên dòng bắt đầu vòng lặp có thể kết quả Có thẩm quyền hướng dẫn tự học: ) Quản lý Truyền thông và thiết bị định tuyến Cisco IOS và các cổng) | 148 Authorized Self-Study Guide Cisco Voice over IP CVOICE Note The T control character indicates that the destination-pattern value is a variablelength dial string. Using this control character enables the router to wait until all digits are received before routing the call. Dial-peer configuration is covered in the section Introducing Dial Peers. Step 8. Specify the voice port associated with this dial peer. Router config-dialpeer port 0 0 0 Example 3-2 shows the complete FXO voice port configuration. Example 3-2 FXO Voice Port Configuration Router config voice-port 0 0 0 Router config-voiceport signal groundstart Router config-voiceport connection plar opx 4001 Router config dial-peer voice 90 pots Router config-dialpeer destination-pattern 9T Router config-dialpeer port 0 0 0 E M Voice Port Configuration Configuring an E M analog trunk is straightforward. Three key options have to be set The signaling E M signaling type Two- or four-wire operation The E M type As an example consider the topology shown in Figure 3-17. Figure 3-17 E M Configuration Topology Chapter 3 Routing Calls over Analog Voice Ports 149 In this example you have been assigned to configure a voice gateway to work with an existing PBX system according to network requirements. You must set up a voice gateway to interface with a PBX to allow the IP phones to call the POTS phones using a four-digit extension. The configuration requirements are the following Configure the voice port to use wink-start signaling. Configure the voice port to use 2-wire operation mode. Configure the voice port to use Type I E M signaling. Configure a standard dial peer for the POTS phones behind the PBX. Both sides of the trunk need to have a matching configuration. The following example configuration shows an E M trunk using wink-start signaling E M Type I and two-wire operation. Because E M supports inbound and outbound DNIS DID support is also configured on the corresponding dial peer. You could then complete the .
