[asterisk-users] No ringback even though progressinband=yes is set

[Steve Davies]

On 7 April 2011 23:04, Douglas Mortensen <doug at impalanetworks.com> wrote:
> Steve. Thanks for the insight. I won't pretend to know what "early-audio" is, but I guess I'm about to find out :-).
>
> Also, I believe that I have a nearly identical setup like this with the exact same SIP provider w/o any trouble. However, I think that system must be running asterisk 1.4 or 1.2 (my guess is 1.4, but I'll have to check to confirm). Is there a significant difference between 1.2/1.4 & 1.6 in this scenario?
>
> Thanks a million!! :-)
>
> -
> Doug Mortensen
> Network Consultant
> Impala Networks
> P: 505.327.7300
> .
>
>
> -----Original Message-----
> From: Steve Davies [mailto:davies147 at gmail.com]
> Sent: Thursday, April 07, 2011 10:49 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [asterisk-users] No ringback even though progressinband=yes is set
>
> On 7 April 2011 17:02, Douglas Mortensen <doug at impalanetworks.com> wrote:
>> Any ideas on why callers who call into my customer's SIP trunk are not hearing a ringback tone? I had this on one other asterisk system, and wound up needing to set progressinband=yes in the SIP trunk config.
>>
>> I have set this on the current system & restarted asterisk, but to no avail.
>>
>> I am using:
>>
>> AsteriskNOW distro
>> Asterisk build is 1.6 from AsteriskNOW repository:
>> asterisk16-1.6.2.17.2-1_centos5 FreePBX 2.9
>>
>> Any help would be greatly appreciated! :-)
>>
>> -
>> Doug Mortensen
>
>
> In my personal experience with SIP and 1.6.x, that mostly depends on where you are sending the call to. It depends on whether the next or subsequent leg tries to use early-audio for the ring tone, or uses a Ringing event to signal that is what is happening. It then depends on whether the originating caller's equipment can understand early-audio ringing.
>
> We have a setup here where all our trunks support early-audio ringing except one (an ISDN30 circuit) and we have to juggle things a bit sometimes to ensure ringing occurs.
>
> Perhaps provide more details? Or you may find that tracing the SIP gives you the clue that you need.
>
> Hope that helps,
> Steve
>
>

Early audio is audio that is sent before the call is "answered",
usually in the form of a custom ring-tone or perhaps a "cannot
connect, try later" message. Some systems do not support it as it can
be abused to communicate at least basic information for free.

We had a problem with this when connecting Asterisk 1.2 to Asterisk
1.6 via IAX. A 1.2 SIP system will automatically switch into early
audio if it sees an early audio frame. 1.6 defaults to not doing this,
but there is a parameter to re-enable it. In this case we solved the
problem by upgrading to 1.6 everywhere :)

Regards,
Steve