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Using your main mobile number via VoIP (with A&A)

Just to add, you can cancel the service at any time from within your control panel. There is no minimum term. You keep the SIM cards, no need to return them. They remain visible and configurable from within the control panel even after you disable/cancel them. Yes, they can be enabled again at any point in the future (even years later) by a click of a button from within your control panel.

SIP2SIM uses Manx Telecom to provide the service.
 
bit odd they don't do a nano sim version and tell you that you can cut it down "at your own risk". How hard is it to do nano sims? I've never heard of anyone not offering them now. All my phones/devices are nano now. Even my huawei 5G modems are
 
Yea, the O2 UK SIP2SIM Voice mobile SIM card and EU roaming SIP2SIM Voice mobile SIM cards apparently have to be cut down to size manually. I ordered the O2/EU roaming SIP2SIM Voice mobile SIM card which supports nano. I guess they buy in bulk and the former are not as popular and so they have a load of old SIM's sitting around.
 
Ok how crazy/stupid is this.
Will this work?
download.webp

So you take a 5G modem that has a telephone output on it, like my Huawei does. You go buy an unlimited everything sim, you plug an ATA into the telephone output of the 5G modem. ATA connects to your internal PBX. Internet access is provided by the same 5G modem.

I'm aware that 5G modems will drop down to LTE when you make a call (at least that's my understanding, i've never actually tired it, in fact i've never ever made a phone call via a 5G modem).

The purpose being to make a self-contained portable stack of equipment that will provide you with VoIP server, that you connect to from wherever with your smartphone app / soft phone over the internet, and the same 5G modem provides both the internet and the telephony. The ATA is because i haven't seen any 5G modem that will route calls from the GSM network to a VoIP PBX. If anyone knows of one that does, let me know.

But would this actually work? or am I crazy ?
 
Ok how crazy/stupid is this.
Will this work?
View attachment 7636
So you take a 5G modem that has a telephone output on it, like my Huawei does. You go buy an unlimited everything sim, you plug an ATA into the telephone output of the 5G modem. ATA connects to your internal PBX. Internet access is provided by the same 5G modem.

I'm aware that 5G modems will drop down to LTE when you make a call (at least that's my understanding, i've never actually tired it, in fact i've never ever made a phone call via a 5G modem).

The purpose being to make a self-contained portable stack of equipment that will provide you with VoIP server, that you connect to from wherever with your smartphone app / soft phone over the internet, and the same 5G modem provides both the internet and the telephony. The ATA is because i haven't seen any 5G modem that will route calls from the GSM network to a VoIP PBX. If anyone knows of one that does, let me know.

But would this actually work? or am I crazy ?
Modem will drop down to 3G, unless VoLTE works on it. Still, might give you enough bandwidth to sustain the VoIP side of things. Worth a try. :)

While at it, you should also think of having a VPN of sorts included, because you may be on the go on some operator that messes up VoIP traffic (such as EE ...). Or just rely on Cloudflare Warp or something, might be simpler.
 
Modem will drop down to 3G, unless VoLTE works on it. Still, might give you enough bandwidth to sustain the VoIP side of things. Worth a try. :)

While at it, you should also think of having a VPN of sorts included, because you may be on the go on some operator that messes up VoIP traffic (such as EE ...). Or just rely on Cloudflare Warp or something, might be simpler.
good plan. I have NordVPN. I'm also thinking of using my old edgerouter that i'm not using to make a sort of UK office gateway for myself. Idea being that I take that out of the UK with me, and it just routes everything connected to it via the NordVPN back to the UK so we can still enjoy iplayer / UK based services etc.

Yeah I was thinking even if it drops down to 3G you only need something like 64kbits for a phone call right? I just need to find an ATA that works both ways, as in can turn a phone line into a SIP gateway rather than turn an analogue phone into a VoIP phone but they do exist or at least, they used to. Just brainstorming but I have plenty of 5G modems now :LOL: and If I could make a self-contained little stack then I can pop it round my mums house and all I will need will be electricity.
 
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Had a quick chat with Grandstream online (super helpful and knew exactly what I was asking). I can ditch the asterisk all together and get a Grandstream HT813 (about £65) to do all of it. And the modem can send and receive SMS via http too. So this looks a lot easier.
 
Had a quick chat with Grandstream online (super helpful and knew exactly what I was asking). I can ditch the asterisk all together and get a Grandstream HT813 (about £65) to do all of it. And the modem can send and receive SMS via http too. So this looks a lot easier.
I think I'm going to get one, too 🤭
 
I think I'm going to get one, too 🤭
cheapest seems to be on Amazon but a US import. Doesn't bother me too much, I can wait and it's 12v anyway so don't care if it comes with a US power adapter (most likely)
 
cheapest seems to be on Amazon but a US import. Doesn't bother me too much, I can wait and it's 12v anyway so don't care if it comes with a US power adapter (most likely)
Yeah saw it on Amazon, £66ish, someone bitching it came preset for US and took a while to configure it, but doesn't sound too bad.
 
All generic ATA’s no matter what country you purchase one in/from are configured for use in North America by default. Always been this way!
 
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Ok how crazy/stupid is this.
Will this work?
View attachment 7636
So you take a 5G modem that has a telephone output on it, like my Huawei does. You go buy an unlimited everything sim, you plug an ATA into the telephone output of the 5G modem. ATA connects to your internal PBX. Internet access is provided by the same 5G modem.

I'm aware that 5G modems will drop down to LTE when you make a call (at least that's my understanding, i've never actually tired it, in fact i've never ever made a phone call via a 5G modem).

The purpose being to make a self-contained portable stack of equipment that will provide you with VoIP server, that you connect to from wherever with your smartphone app / soft phone over the internet, and the same 5G modem provides both the internet and the telephony. The ATA is because i haven't seen any 5G modem that will route calls from the GSM network to a VoIP PBX. If anyone knows of one that does, let me know.

But would this actually work? or am I crazy ?
I do have to say I have a feeling that whilst it would work, it would be highly unreliable. Even on Three with the fixed IP APN, in my experience SIP connections aren’t super reliable over mobile networks for whatever reason.
 
I do have to say I have a feeling that whilst it would work, it would be highly unreliable. Even on Three with the fixed IP APN, in my experience SIP connections aren’t super reliable over mobile networks for whatever reason.
For me it worked great on Three, both apn. On EE not at all.
 
For me it worked great on Three, both apn. On EE not at all.
Was that with a softphone app that had push notifications?

I tried both a Cisco ATA and one of those Gigaset VoIP capable base stations and just couldn’t get it to function perfectly, every time.
 
Was that with a softphone app that had push notifications?

I tried both a Cisco ATA and one of those Gigaset VoIP capable base stations and just couldn’t get it to function perfectly, every time.
Yes, acrobits. Also even the desktop app (linphone) works perfectly on Three, but can't hear anything on EE. I understand they do some extra filtering on udp.
 
I had some free time this weekend, so I played around with raspbx (raspberry pi asterisk + FreePBX) and I played with both chan_dongle and chan_mobile. To be honest, it's not as good as it was. Chan_dongle for example hasn't been touched in almost 10 years from a code perspective. I had previously used it when I spent 7 years working Sweden and back then (this was like 2012-2019) I remember it working well but I haven't been able to make a workable system now. I also played with chan_mobile (bluetooth connection to the phone) and the call quality was horrible. Garbled, low quality etc.

Since I'm being pretty serious about wanting to have VoIP access to my mobile number I have now paid for a GSM gateway which should arrive sometime next week. I had thought about porting over to AAISP but what stops me is that i'm still under contract with three for my business lines (I have 4 lines with them) so cutting off would incur a significant financial penalty. That and the costs of making calls via AAISP. I probably spend 5-6 hours a week talking to people on the phone (why can't they use zoom/telegram/whatsapp?!?) and that would add up very quickly compared to a UK SIM with all inclusive minutes.

I had thought to simply forward my mobile calls from my numbers to AAISP but the problem comes in returning calls, they would not appear from my number, incoming would work, but outgoing would appear from whatever local SIM I was using abroad, so I've invested in the GSM gateway. YOLO and all. Hopefully I can sell it on eBay one day if I don't need it any longer. But this at least gives me the freedom to simply pop my UK SIM into the gateway, jet off to wherever around the world, buy a local SIM wherever I am and still be able to send/receive calls and SMS from wherever I am.

I will probably look at moving over my main business numbers on to AAISP in 6 months and perhaps selling off the GSM gateway when the time comes and hopefully not lose too much on that. They seem to hold their price even used.

I went for a Yeastar TG200 VoIP GSM Gateway 2 (2 lines, 2G/3G/4G apparently). And this should allow for me to pop my SIMs in there, and make calls for free to UK numbers (99% of my calls being UK anyway). I guess I can write up how it works if anyone is interested, when it arrives. Really would like to just use AAISP but not ready to port my numbers to them just yet. Plus I did it for the lulz. And to have the flexibility of either SIM in my phone, in the UK, or SIM in the gateway and access it over VoIP from wherever. I still have an O2 contract with free EU roaming so in theory I should be able to make and receive UK calls across Europe for free (well, plus the local SIM costs of course). Honestly, UK people baulk at the idea of calling a non UK number so it's probably worth it. Will put it down as a business expense too.
 
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Nice @dabigm, useful feedback.
A yeastar+grandstream howto would be good.
 
@Lucian question for you. Can you call your AAISP VoIP number from Lyca?

I signed up, requested a new number, I can call it from Three, I can call it from my sipgate account, but if I call the number from Lycamobile it says "You've dialled an incorrect number, please check the number and try again".

Bit odd.
 
I can @dabigm but then it's a 01 number that I ported in to AAISP.
yeah odd. AA say that they don't see the "traffic hitting our network" and i've sent them a log of calling the number from two different lycamobile SIMs now. Hopefully they can figure it out. Works absolutely fine calling from other networks though.
 
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