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[asterisk_list at earth...]

I'm having a problem with a new SIP trunk.

Calls within the UK to fixed lines are fine, but calls to mobiles have
noticeably poorer audio quality.

I thought it might have been a codec issue; we have used G.726 for internal
and external calls (over primary ISDN and GSM). So I tried allowing "alaw",
(G.711 A-law) which is the native codec used within the PSTN in this country,
but this made no improvement.

We had
disallow=all
allow=g726

in the [general] section of sip.conf. In the section for one of the phones, I
added
allow=alaw
and then inserted
Set(SIP_CODEC=alaw)
in the relevant part of extensions.conf. For good measure, I also added
NoOp(Codec was ${SIP_CODEC})
in the "h" extension. The messages in the Asterisk CLI appeared to show that
the audio codec was correctly being set to "alaw", and on hangup I got "Codec
was alaw", but there was no improvement to the sound quality.

Is there something I am doing wrong, or do I need to get in touch with our SIP
trunk provider?

--
AJS

Note: Originating address only accepts e-mail from list! If replying off-
list, change address to asterisk1list at earthshod dot co dot uk .

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[jthomasdpu at gmail.com]

Is the quality the same incoming from mobile as outgoing to mobile?


On Wed, Jul 30, 2014 at 4:51 AM, A J Stiles <asterisk_list@earthshod.co.uk (asterisk_list@earthshod.co.uk)> wrote:

[asterisk_list at earth...]

On Thursday 31 Jul 2014, James Thomas wrote: