FOOD FOR THOUGHT HD Voice from PBX to the big 4 Wireless Carrier Networks

scourtney2000

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Hello,

I was participating on a Ring Central confernce call from my mobile phone using T-Mobile service. It was HD Voice end to end.

It go me thinking that there must be a SIP Trunking provider that has made direct connections to the Wireless carriers and can handoff and possible transcode calls using wideband codecs.

Is there a SIP Trunk that supports g.722, OPUS, AMR-WB? Could it be phone calls originating on VoLTE-capable networks is the reason I experienced HD Voice on Ring Central?

Has anyone heard of such animal in the wild?

Thanks
 

atsak

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Any carrier that does not proxy the RTP media stream will allow you to use G.722 if the carrier you're interconnecting to supports it. I see HD Voice calls using T-Mobile in the US and Telus in Canada most of the time on Voip Innovations and Anveo Direct, for example. I have G.711 set as preferred on the SIP settings to make sure nothing weird happens in codec negotiation with carriers but have G.722 supported on the PBX and G.722 set as preferred on the phone (Yealink T48 and Cisco SPA542). You could probably play around with this a bit and see if you had any no audio issues if you set G.722 all the way through as preferred. There are several carriers that do not proxy RTP.
 

scourtney2000

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Thank you for the reply. Very interesting. I never thought of it like that. I guess it also depends ont he carrier and the users cell phone. I have been reading about VoLTE and AMR-WB. I thought it would be a great niche for a SIP Trunk provider to negotiate with the 4 major carries and provide direct links to their wireless customers.

I guess I live in a dream world. I don't think HD between wireless carries exists, so why would a SIP Trunk provider that can guarantee HD between a PBX and the big 4 would exist. It would be really cool.

Call centers, small businesses, who wouldn't want to an HD Voice connection to wireless cusomters?
 

atsak

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The carriers have no real commercial interest in making inter-carrier calls sound better. Here's their thought process:

"Oh, we can give clients better call quality"
"Great, let's do that"
"Oh we can connect to other carriers who are doing the same thing and give everyone call quality improvements"
"Why would we care they aren't our customers - what if we say we give all [insert large ILEC based telco name here] customers better call quality when calling each other? Then it's a competitive advantage and people will tell all their friends and family to use our stuff"
"Oh OK I just thought . . "
"No, don't do that, just think how we can get more customers and make it better just for them, but only sometimes, so we can charge more, but not have them expect more either, everyone else we'll only do what the FCC (or CRTC etc) makes us"
 
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