I have configured a SIP trunk in CCM 4.0. outgoing calls are working perfectly. but when dials SIP trunk from outside (incoming calls), it says "Network Busy". can anyone help me how to receive all incoming calls from SIP trunk to IP phone registered...

In my setup, there's a PSTN line connected to IVR. Anyone can dial PSTN number from outside and once the call is connected to IVR, he can enter the desired extension number. Assume PSTN number is 0114556677 and desired extension is 1000. Is there a w...

Please refer the drawing. We got a SIP trunk from service provider and connected to existing CCM. Assume there are 5 telephone extensions connected to CCM starting from 1001-1005. Only 2 direct numbers provided with the SIP trunk. My ultimate requir...

Hi,We have Cisco 2811 with CCME and also act as H.323 gateway for branch VOIP traffic. Cisco IP phones are registered in the router and there's a PRI E1 connection to PSTN cloud from the router. One Service provider offers SIP trunk.Q1. Is it possibl...

the SP provided a ISDN PRI voice E1 (q931)and told me they have enabled 4 channels for testing. when i plug the link to router, there is an alarm in the router and SP's rack alarms get cleared. attached herewith router config and error when trying to...