I have a customer running R11.0.4.5 with SIP trunks. Everything about the SIP trunks appears to work correctly except the audio issue we are experiencing with twinning on the SIP trunks. In the past, when I encountered this issue, I would turn on keep alives under System>LAN1>VOIP and it would resolve the issue but not in this case. What is odd is whatever value I set for the keep alive timer the SIP trunks while twinning will start to get audio after that timer.
IE keep alive is setup for 5 seconds
You twin a call and get no audio for first 5 seconds and then audio starts after 5 seconds. If I adjust the timer it follows the timing so I know it is that value making a difference. I can set it as low as 2-3 seconds (1 second it seems like the audio cuts off after a bit). It makes it "usable", since you are without audio only for 2-3 seconds, but it is still not right.
Customer is in control of firewall it is a Mikrotik firewall which I am not familiar with at all. Wondering if anyone has had this issue and what they might suggest I ask the firewall guy to try (assuming the issue is in the firewall but Ill gladly make changes in the IPO as well). We actually initially had issues even getting audio with network topology being used in the IPO but that was finally resolved today so I feel like we are close. IT is saying he sees the RTP traffic, it is sent to the IPO but it waits the 2-3 seconds before accepting it. He says SIP_ALG is disabled (seemed like it was enabled till today but network topology works so I tend to believe it is disabled now).
The truth is just an excuse for lack of imagination.
IE keep alive is setup for 5 seconds
You twin a call and get no audio for first 5 seconds and then audio starts after 5 seconds. If I adjust the timer it follows the timing so I know it is that value making a difference. I can set it as low as 2-3 seconds (1 second it seems like the audio cuts off after a bit). It makes it "usable", since you are without audio only for 2-3 seconds, but it is still not right.
Customer is in control of firewall it is a Mikrotik firewall which I am not familiar with at all. Wondering if anyone has had this issue and what they might suggest I ask the firewall guy to try (assuming the issue is in the firewall but Ill gladly make changes in the IPO as well). We actually initially had issues even getting audio with network topology being used in the IPO but that was finally resolved today so I feel like we are close. IT is saying he sees the RTP traffic, it is sent to the IPO but it waits the 2-3 seconds before accepting it. He says SIP_ALG is disabled (seemed like it was enabled till today but network topology works so I tend to believe it is disabled now).
The truth is just an excuse for lack of imagination.
