Greetings,I’m looking for a really cheap GSM-SIP gateway, Single channel (one SIM card). any suggestions?
We’ve been using OpenVox G400P cards (PCI; there is also a G400E, which is PCI express for newer motherboards). Sends and receives text messages, and makes and answers phone calls. Accepts up to four RF modules, each of which accepts one SIM card.
If you only need text message functionality (not voice calls), then almost any old mobile phone with a USB or RS232 cable can be used as a GSM modem
Thank you for the reply, actually we are looking for something like the followinghttp://www.ebay.com/itm/GSM1SIP-GSM-over-IP-GoIP-SIP-Quad-Bands-voip-gateway-Quad-band-1XGSM-GoIP-VoIP-/181075100268how ever our requirement are a bit wire like SMS in addition to Call capability.