<div dir="ltr">Is the quality the same incoming from mobile as outgoing to mobile?</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Jul 30, 2014 at 4:51 AM, A J Stiles <span dir="ltr"><<a href="mailto:asterisk_list@earthshod.co.uk" target="_blank">asterisk_list@earthshod.co.uk</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I'm having a problem with a new SIP trunk.<br>
<br>
Calls within the UK to fixed lines are fine, but calls to mobiles have<br>
noticeably poorer audio quality.<br>
<br>
I thought it might have been a codec issue; we have used G.726 for internal<br>
and external calls (over primary ISDN and GSM). So I tried allowing "alaw",<br>
(G.711 A-law) which is the native codec used within the PSTN in this country,<br>
but this made no improvement.<br>
<br>
We had<br>
disallow=all<br>
allow=g726<br>
<br>
in the [general] section of sip.conf. In the section for one of the phones, I<br>
added<br>
allow=alaw<br>
and then inserted<br>
Set(SIP_CODEC=alaw)<br>
in the relevant part of extensions.conf. For good measure, I also added<br>
NoOp(Codec was ${SIP_CODEC})<br>
in the "h" extension. The messages in the Asterisk CLI appeared to show that<br>
the audio codec was correctly being set to "alaw", and on hangup I got "Codec<br>
was alaw", but there was no improvement to the sound quality.<br>
<br>
Is there something I am doing wrong, or do I need to get in touch with our SIP<br>
trunk provider?<br>
<span class="HOEnZb"><font color="#888888"><br>
--<br>
AJS<br>
<br>
Note: Originating address only accepts e-mail from list! If replying off-<br>
list, change address to asterisk1list at earthshod dot co dot uk .<br>
<br>
--<br>
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</font></span></blockquote></div><br></div>