troubleshooting Question

Sporadic audio on VOIP over VPN

Avatar of s_sykes
s_sykesFlag for United States of America asked on
VPNVoice Over IP* sip* Fortigate
3 Comments1 Solution82 ViewsLast Modified:
I am trying to let our employees use our phone software at home.  Normally we do not do this, so I equipped them with a VPN login and the phone sofware and thought it would work.  They are able to make and receive calls, but not all calls have audio.  That is the strange part, it works some of the time, so I assume that my firewall/ vpn config is okay.  I have had more success with users on Verizon internet than on Comcast.

Is there a reason that RTP packets would flow in each direction for some calls but not others?  It seems like a routing or QoS problem.  It's very strange.  I can make 5 good calls and then 3 will fail.  I'm using an IPSEC vpn client and a softphone application.  It's seems like the SIP side (call setup) works just fine, but audio (RTP) comes and goes.  I tried lowering the firewall on my Comcast connection, but that didn't seem to help.

Thanks!
Join the community to see this answer!
Join our exclusive community to see this answer & millions of others.
Unlock 1 Answer and 3 Comments.
Join the Community
Learn from the best

Network and collaborate with thousands of CTOs, CISOs, and IT Pros rooting for you and your success.

Andrew Hancock - VMware vExpert
See if this solution works for you by signing up for a 7 day free trial.
Unlock 1 Answer and 3 Comments.
Try for 7 days

”The time we save is the biggest benefit of E-E to our team. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange.

-Mike Kapnisakis, Warner Bros