问题背景
CUCM上注册的话机通过SIP trunk外呼失败
以下是典型的案例
通过SIP trunk下的配置检查SIP trunk 状态,显示为503.
根据CUCM error message guide
For Remote=503, possible reasons include
1) route/sip trunk for originating side doesn't exist on remote peer;
2) route/sip trunk for originati...