Another thing you may want to do is try a simple ping test to the far
end host. While this may not always be a reliable way to test lag
given that the far end maybe just a proxy and your RTP may be
terminating to another device, it still should give you a good idea
what your lag times are at least on the signaling end of things. You
could also do a traceroute to see how many hops your having to jump
through as well.
You could use a tool like ngrep to actually see the sip signaling and
copy out the media gateway from the SDP if you really wanted to, and
do a ping on that.
I've done extensive work with international voip origination and
termination, and typically I haven't had any problems unless it's
going over satellite (lag) or there is a problem at the far end
(usually pdd or quality issues).
If things keep up, I'd even consider running top during a call to see
what kind of utilization your local server is at just to make sure
something isn't wrong there either.
Hope this helps,
- Darren
_____________________________
[EMAIL PROTECTED]
http://www.darrensessions.com
_____________________________
On Aug 18, 2008, at 10:41 AM, Nikhil Nair wrote:
Hi,
I'm running a small Asterisk server in the UK, just for personal use.
I've been experimenting with various VoIP providers for international
calls to PSTN numbers, particularly to the US (often California). My
results, to date, have been very variable indeed, so much so that I'm
considering getting a suitable card and using the PSTN.
I have found a VoIP provider with an excellent reputation, and it
gives
very good quality. However, I seem to get quite a bit of delay at
times,
enough to make conversation awkward. As the setup at the far end
was not
completely trivial, I'm not 100% sure the problem was in my
connection,
but I'd like to test that.
Are there any US numbers I can call to get an Asterisk-style echo
test?
Ideally, a California-based numnber, so I can try to call it from an
ordinary PSTN phone here, and compare calling via VoIP, and see if
there's
an appreciable difference in the delay/quality. I don't anticipate
using
this for very long, so it doesn't necessarily need to be a free
service.
Failing that, does anyone have access to a US-based Asterisk server
which
would allow me to make connections to its echo test? Presumably, if
I had
this, I could rent a PSTN number from a US-based provider, and point
it to
the appropriate SIP/IAX address. I expect my total usage would be
just a
few minutes, though having the facility available for a few weeks
would be
helpful, to allow me to play around with various options. Again,
I'd be
willing to pay a modest amount for this.
Thanks in advance for any suggestions!
Best wishes,
Nikhil.
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