[VoIP] Legacy Ringback from Recordings in Asterisk

[Greg Blakely]

No.

As usual, it is a cobbled together scenario.

Here is the basic flow:


PSTN switch PRI => My asterisk at work => my asterisk at home => my
phones


The PSTN switch is a Siemens EWSD, and it is providing an ISDN PRI (TDM)
to a Digium T1 card.  The EWSD is set up to relay the Asterisk's
ringback tones to the caller rather than provide its own.

The asterisk at work is set to forward certain of the DID block via SIP
to my home Asterisk box.  There, it is routed to either a Digium card to
a channel bank, or to a SIP or IAX2 device.

I had originally thought that, in the case of the t-mobile calls, their
cell switch was set up like a Lucent class 4 switch to only pass audio
one way until the answer supervision was received.  But it's the OTHER
way that is disabled, so... Scratch that idea.

I'm left to wonder if one of the two voice types that the EWSD is using
is incompatible with a ULAW formatted recording.

 

> -----Original Message-----
> From: voip-bounces at ckts.info [mailto:voip-bounces at ckts.info] 
> On Behalf Of John Novack
> Sent: Saturday, April 21, 2007 3:38 PM
> To: Voice Over IP Tandem for Analog Switches
> Subject: Re: [VoIP] Legacy Ringback from Recordings in Asterisk
> 
> CNET number(s)??
> 
> Shouldn't Asterisk handle any codec translation needed?
> 
> I have, as do others, recordings for ringback on several 
> numbers, and there doesn't seem to be a problem.
> 
> 
> John Novack
> 
> Greg Blakely wrote:
> > I have noticed that not everyone can hear my ringback tone.
> >
> > For example, when I call in from my t-mobile phone, I hear 
> silence until
> > the call is answered.
> >
> > Additionally, when my mom calls long distance from Colorado 
> Springs, she
> > says that all she hears is a "weird noise" until the call 
> is answered.
> >
> > Thinking that it may have to do with the codecs accepted 
> for incoming
> > calls, I am left to wonder:
> >
> > Should I have a .gsm file in the same directory?   
> >
> > (I have an ISDN PRI line that accepts two different audio 
> types (au3 and
> > another I can't remember), as well as C56 and C64.
> >
> >
> >
> >
> > John Covert wrote:
> >   
> >> It has been asked before if it's possible in Asterisk to use 
> >> a recording for ringback.  The answer is YES.  IMHO, don't 
> >> bother unless you've got a good ulaw recording, but anyway, 
> >> here's how.
> >>
> >>
> >>     
> >  8<  SNIP    8<   
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