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We had phones in Perth hooked up to an Asterisk box
in Melbourne, and the call was fine - so I know it can be done.
PaulH
----- Original Message -----
Sent: Tuesday, January 10, 2006 11:02
AM
Subject: Re: [Asterisk-Users] MTU and
Voice Delay (latency??)
How far (physically) is the Asterisk server location from the
location of the phones? Have you tried pinging the Asterisk server from the
network to which the phones are connected?
As a rule of thumb, If the
two sites are within 2500 miles of each other and the network connection
between them is working properly, the round trip time for a 64 byte ping
should be less than 100 ms, the round trip time should not vary from one ping
to another by more than 2-5 ms (typical), and there should be virtually no
dropped packets (well under 0.1%).
If your network does not meet these
standards, then it may well be the cause of your problems. In that case, if
you e-mail me a traceroute from the phone location to the Asterisk location as
well as the output of a ping from the phone location to the Asterisk location
(preferably including at least 100 repetitions), I will take a look at it and
let you know what I think.
If your network seems fine by the above
standards, then you/we will have to pursue other Asterisk/SIP/RTP-related
avenues of troubleshooting.
Regards,
Rusty
On 1/9/06, Geoff
Manning <[EMAIL PROTECTED]>
wrote:
Our
users are experiencing some unacceptable delay when trying to have
a
conversation. The delay is so noticeable that they keep stepping on
each
others words and resort to calling the customers via cell
phone.
Here is the setup
SDSL Connection (PPPoA)
Speedtouch
610 SDSL Modem
3Com 2224PWR Plus Switch (phones on separate VLAN)
8
Cisco 796 Phones
All connecting to a remote Asterisk
Server.
We found that the MTU for the SDSL modem was set to 1500 and
I have since
changed it to 1458 which is the ISP's recommended
setting.
Can this MTU difference cause the delay my users are
experiencing? All the
voice packets would become fragmented so it sounds
logical.
And simply changing the MTU on the modem, will that fix it,
I can't find a
way to change it at the Cisco phone
level.
Thanks,
Geoff
Manning
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