[asterisk-users] Call quality issue across VPN-> POTS vs SIP

[Lincoln King-Cliby]

Just as an interesting follow-up/additional information, if I place a call to Site 2 on a POTS line, someone at Site 2 answers the call (using one of the Cisco phones) and then transfers it to me across the VPN the call sounds fine.

So I think Bob's question was on the right track with it being a CODEC issue, but I'm not sure how I need to deal with that for the ZAP channel type.

Thanks again,

Lincoln

--
Lincoln King-Cliby, CTS
Applications Engineer
ControlWorks Consulting, LLC
Crestron Authorized Independent Programmer

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Lincoln King-Cliby
Sent: Monday, November 03, 2008 1:17 PM
To: 'Asterisk Users Mailing List - Non-Commercial Discussion'
Subject: Re: [asterisk-users] Call quality issue across VPN-> POTS vs SIP

Bob,

It's conceivable, but how would I verify this and how would I change it if that was the problem?

The site that those calls terminate at is using an Asterisk Appliance so most of the config is "done for you" but it is possible to tweak the underlying configuration files (and I also have SSH access so I can do asterisk -vvvvv -r) -- If I know what I need to tweak.

Thanks,

Lincoln

--
Lincoln King-Cliby, CTS
Applications Engineer
ControlWorks Consulting, LLC
Crestron Authorized Independent Programmer

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Bob Pierce
Sent: Monday, November 03, 2008 12:18 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] Call quality issue across VPN-> POTS vs SIP


On Mon, 2008-11-03 at 11:14 -0500, Lincoln King-Cliby wrote:
> Any ideas why the audio quality would be so markedly different when
> the only thing that seems to be different is where the call is
> originating from (POTS line vs. SIP phone)?

Is it possible that calls from your POTS line are going across the VPN
as uLaw while the calls from the sip phones are using a compressed
codec?

Bob

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