SIP voice call issue "no audio"

Hi Fabio,

SIP can be blocked via Application control as we have a signature under Web > App Control. If you do not capture any drop logs anywhere I suspect that the disconnection occurs from the UTM side. When a call get's disconnected did you check the WAN link usage in logging and reporting> Network usage; is it fully utilized. Also check that Anti-DoS is not configured.

Thanks

Hi Fabio,

SIP can be blocked via Application control as we have a signature under Web > App Control. If you do not capture any drop logs anywhere I suspect that the disconnection occurs from the UTM side. When a call get's disconnected did you check the WAN link usage in logging and reporting> Network usage; is it fully utilized. Also check that Anti-DoS is not configured.

Thanks

Hi Sachin,

our Application control section is Disabled and IPS is not active on SIP network interface. The problem that happens more often is the call without audio: checking the SIP log session all seems OK but we need to investigate if there is some particular reason for the firewall to rejected or drop audio packet after SIP session is active.

Thanks a lot for the moment!

Fabio

Hi Fabio,

If it is an intermittent issue, I doubt it has anything to do with the UTM. As UTM will not permute the communication dynamically. Again, when you disable Intrusion Prevention, you only disabled Snort - you do not disable the items on the other tabs. For example, many people are tripped up by the UDP Flood Protection which is logged in the Intrusion Prevention log file. This is often the cause of bad voice-quality with VoIP on the UTM.

Thanks

Hi, Fabio, and welcome to the UTM Community!

Please read #1 in Rulz.

Cheers - Bob

Hi Sachin,

Thanks for the suggest. I have checked IPS log but I didn't found anything about dropped packet related to SIP communication. Also we don't have any of Anti-DoS/Flooding option active.

We will continue to investigate.

Fabio

Hello Bob,

Thanks for the suggest, we have already read it.

Fabio