[VoiceOps] Cell Phone to SIP provider

[Matthew S. Crocker]

Of course there is no reason why SIP couldn't be used for signaling and just establish the voice over a GSM / CDMA codec. The cell tower could transcode to RTP. Getting SIP direct to the handset would be good . The cell towers would just need to act like a SIP proxy 

----- Original Message -----

> From: "Paul Timmins" <paul at timmins.net>
> To: "Scott Berkman" <scott at sberkman.net>
> Cc: "VoiceOps at voiceops.org" <voiceops at voiceops.org>
> Sent: Wednesday, September 14, 2011 12:07:14 AM
> Subject: Re: [VoiceOps] Cell Phone to SIP provider

> My android phones do SIP user interface integration over HSDPA and
> EVDO respectively, and frankly, the voice quality isn't that great.
> Much worse than the underlying GSM or CDMA signal bar for signal
> bar.

> There's a reason the carriers aren't doing this yet.
> -Paul

> On Sep 13, 2011, at 11:32 PM, Scott Berkman wrote:

> > You might want to see if LightSquared has anything for you, they
> > dub
> > themselves the “only wholesale-only mobile carrier”, but I’m not
> > sure what they can offer today.
> 

> > http://www.lightsquared.com/
> 

> > Also, aren’t some of the newer cellular technologies (UMTS or EVDO)
> > inherently built on SIP for the voice portion of the network?
> > That’s
> > not an answer to your problem, but…
> 

> > One other thing you might want to look into is an OS that allows
> > the
> > default phone app to use SIP over the data connection natively (as
> > opposed to using a separate soft phone application that might not
> > integrate as well to the UI). I believe this was preset in versions
> > of WM6, but that’s somewhat old now and I have no idea if it’s
> > built
> > into any other platforms.
> 

> > http://voipguides.blogspot.com/2008/05/voip-sip-client-for-windows-mobile-6.html
> 

> > -Scott
> 

> > From: voiceops-bounces at voiceops.org
> > [mailto:voiceops-bounces at voiceops.org] On Behalf Of Carlos Alvarez
> 
> > Sent: Tuesday, September 13, 2011 3:44 PM
> 
> > To: VoiceOps at voiceops.org
> 
> > Subject: Re: [VoiceOps] Cell Phone to SIP provider
> 

> > It is my understanding that:
> 

> > a. The original post asked about sending the calls to the end point
> > (cell phone) as SIP, not cellular voice.
> 

> > b. Sprint's MIS (Mobile Integration Service) merely allows a
> > company
> > or service provider to connect to them directly over TDM or SIP and
> > do seamless integration of the cell and other phones, but the call
> > is still cellular voice to the handset.
> 

> > I am facing a competitive sale right now to a municipality where
> > there is only one other carrier who can compete with us, and only
> > on
> > that one feature.
> 

> > On Tue, Sep 13, 2011 at 12:33 PM, Matthew S. Crocker <
> > matthew at corp.crocker.com > wrote:
> 

> > Sprint does this. The cell phones register to the cell tower as
> > cell
> > phones. The cell tower converts to SIP and registers with the call
> > agent. Broadsoft mentioned something about this at the last
> > connections conference. You would get a private IP connection into
> > Sprint to carry the voice traffic. This would be perfect for me if
> > Sprint had a decent cell network in my area. Does anyone know if
> > AT&T or Verizon (LTE) do it as well?
> 

> > http://newsroom.sprint.com/article_display.cfm?article_id=1628
> 

> > > From: "Oren Yehezkely" < orenyny at gmail.com >
> > 
> 
> > > To: " VoiceOps at voiceops.org " < voiceops at voiceops.org >
> > 
> 
> > > Sent: Tuesday, September 13, 2011 1:00:02 PM
> > 
> 
> > > Subject: [VoiceOps] Cell Phone to SIP provider
> > 
> 

> > > Hello,
> > 
> 

> > > I am looking for a cell phone company that is capable of
> > > providing
> > > SIP service instead of sending the calls over the cellular
> > > network.
> > 
> 

> > > If anybody here is capable of providing such a service or can
> > > recommend a vendor that can do that, please let me know.
> > 
> 

> > > Thanks,
> > 
> 

> > > Oren
> > 
> 

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> > --
> 

> > Carlos Alvarez
> 

> > TelEvolve
> 

> > 602-889-3003
> 

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