I have 2 routers 2801&3825 connected back-to-back with ethernet via satellite link. Local networks are routed via GRE tunnel. Problem is in bad voice quality beetwen routers due to bid delay in sattelite path. Is it possible to create FR or PPP tunnel beetwen segments to get RTP compression working to improve voice quality?
The most important cause of your problems is the long and very variable delay of the satlink. What little can be gained by using rtp compression is then consumed by the extra overhead that would be needed for the tunnel encapsulation. In the end, you will only be increasing the load on the cpu's.
As I learned by eperience, the two most important issues are:
1: Reduce packet loss. Make sure that an optimal radio path exists to reduce packet loss as far as possible
2: Reduce jitter. Take measures to reduce the jitter such as implementing a suitable queueing scheme.
Overbooking of the sat-bandwidth is a killer for voice also. It costs money but dedicated bandwidth pays off.
Main site router 3825 is connected with Ethernet port via optical modems to provider satellite equipment. Remote end connected with Ethernet port to 2801. Voice path from main site is normal, but voice from remote to the main all the time is interrupted. This satellite channel have no data and other concurrent traffic, just using to trnsmit 1 voice speech.
We are pleased to announce availability of Beta software for 16.6.3.
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