Check the sip trunk between 2811 and SBC. Enable options ping and ensure that you are getting a reply.    Also check the ip address of 2811 is in trusted list for SBC.

Hi Anirudh   For incoming calls , only PSTN provider can decide whether he wants to send call in round robin fashion on 2 VGW's or send call to other gateway once all channels of first one are finished.   Whenever a call is sent from provider and gat...

Your CME is sending INVITE to SBC but no response from it. Ensure the "sip setting" on SBC, and ensure sip trunk is up between CME and SBC.

Hi Ani1. For incoming redundancy you can contact PSTN provider and it depends on his routing algorithm whether circular of Top Down approach. You need to keep your call routing same for calls coming from either of the PRI.2. For making redundancy of ...

What is you input number, number of digits and how do you want it to go out. Do you need to remove some digits or just append to the incoming called number.