[alophawen]

Last I worked with telephony (around 2010), IIRC we recieved calls over 3G network as SS7/H323 using Dialogic hardware and converted them on the fly to SIP as they entered our systems.

The whole PBX was running on SIP using Asterisk.

[cyberax]

I'm really intrigued. Is it possible to get video calling working with mobile networks' own video calling support over LTE? I could never find how it's done.

[darkclouds]

I've not done that personally, but I'd have a look on the freeswitch forums to see if someone on there has already done it.

I have had the free 3CX sip client on an android mobile, using a UDP vpn back to a freeswitch server which was connected to the UK phone system. Proof of concept thing.

Because of the nature of the mobile data, which is like bursts of data, it made it hard to have a conversation even around midnight and 1am when cell traffic volumes are low.

I was told UK Telco's give voice data priority as this needs to be realtime and then other data has lower levels of priority making it hard to have a reliable stream of data.

FYI, 56K is the minimum standard for voice calls, although with 4G and beyond, its possible to hear the higher bitrate protocols being used on the main mobile networks, as its not so muffled, like someone turning up the high end frequency's on a graphic equaliser, and they are fully down with the 56k protocols.

I dont know what the minimum video protocol bitrate would be, but I did find this which might be useful. > H.264 will only consume around 10 kbps with around 2 fps in 176x144.

When Skype first came out, it was peer to peer, so as a proof of concept to test the new 3G network I did manage to maintain a voice call for an hour which was impressive, but also shows that mobile networks can maintain the mobile data streams if its not encrypted inside a VPN in the UK.

[cyberax]

> I have had the free 3CX sip client on an android mobile, using a UDP vpn back to a freeswitch server which was connected to the UK phone system. Proof of concept thing.

I don't think any of the US networks do that, unless you want to set up your own phone operator :(

[posguy]

Yes, T-Mobile and a few other carriers support videocalling right in the Android dialer.

https://www.t-mobile.com/support/plans-features/t-mobile-vid...

[cyberax]

I've seen it work _once_, around 8 years ago on a T-Mobile branded Galaxy S phone.

I don't think it still works, and/or it requires some strange confluence of events to work.

[alophawen]

I managed to get video working between 3G and SIP, so I expect so.

I developed 3G video phone dating in 2010.

I recall bambuser also used to have a live video streaming over 3G app around that time.