Use two test extensions to align local bindings, advertised addresses, port forwarding and RTP.
沿用 7101、7102 和实验 Profile，把 SIP 监听、公网宣告、端口映射和 RTP 收发逐项对上。
Add a test SIP listener and verify registration, INVITE authentication and routing.
新增测试SIP监听，分别验收注册、INVITE鉴权与实际路由。
Configure and verify internal caller ID, carrier presentation and outbound permission.
用7101和7102验证内部主叫、运营商主叫与外呼权限。
Match an approved destination, remove its local access digit, and apply the carrier format.
沿用7101与7102，配置精确号码匹配、去接入码和中继前缀。
Configure a carrier gateway, route one authorized test destination, and verify registration, calls and rollback.
配置注册型和IP型gateway，用7101/7102完成受控外呼，讲清参数、加载、状态判断、验收与回退。
