There are a lot of GSM-SIP gateways avaiable on the market: http://www.voip-info.org/wiki/view/VOIP+GSM+Gateways Afaik there is a software gateway for Asterix, which uses any Bluetooth-connected mobile phone to handle calls.
router: AVM Fritz!Box Fon 7390 with Huawei K3765 USB modem attached as GSM voice gateway VoIP-providers: intervoip.com | sipgate.de (German DID) | sipgate.co.uk (British DID) | sipcall.ch (Swiss DID) connection: 100/5 MBit/s (DOCSIS 3.0) mobile devices: Huawei P6 | Nokia Lumia 630 Dual SIM | Huawei: E5832, E1762, K3715, K3765 | Qualcomm Gobi 2000 in Sony VAIO VPC-Z12X9E/X
I got a cheap GSM-SIP gateway from a crowd in Taiwan, which I had my doubts about. It cost about $250, but it seems to be working well and I've got no complaints with it so far - see www.portech.com.tw.
Yes, I use Asterisk on Ubuntu with absolutely no problems at all.
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