rohc team mailing list archive

[Florent Bertero <question219552@xxxxxxxxxxxxxxxxxxxxx>]

New question #219552 on rohc:
https://answers.launchpad.net/rohc/+question/219552

Hello team, 

I am using rohc 1.5.1 on 2 servers Centos 4.x and 5.x.
I installed from sources following your wiki and tunnel is up with data transfer OK.

It seems to be working fine but I need rohc to compress RTP flow, so I set up a tunnel on 2 asterisks and created a sip trunk in this rohc tunnel.

Here is the command I use:
/opt/rohc/sbin/rohctunnel rohc0 remote "public ip 1" local 192.168.1.50  port 5000 3> /opt/rohc/comp_stats 4> /opt/rohc/decomp_stats &
and:
/opt/rohc/sbin/rohctunnel rohc0 remote "public ip 2" local "public ip 1" port 5000 3> /opt/rohc/comp_stats 4> /opt/rohc/decomp_stats &
I use local IP on server 1 because it is behind a router.

It is up and sip calls (g729) connect.

However, I need to verify rohc's compression rate.
Thus, I used 2 different tools to monitore bandwidth: iftop and a router calculating BP stats.

My problem is that a call going through rohc takes as much BP as a non compressed one (about 30kb/s).
I tried up to 3 calls and no difference were noticed.

Compression logs  during call shows that it is working:
206     O-mode  SO      60      28      36      4       0

FYI, asterisk trunks are set with "canreinvite=no" to be sure that RTP goes through the tunnel and not directly to the public IP.

Does anyone have an idea?

Thanks in advance
Florent

-- 
You received this question notification because you are a member of ROHC
Team, which is an answer contact for rohc.