Add GSM to existing FreePBX installation

I purchased an existing FreePBX off ebay with 8 FXO and 8 FXS, but I don’t have any land lines so I was going to install an ATCom or OpenVox GSM card but I don’t know how to do that without breaking the whole system.

For the ATCom, I am supposed to install Dahdi-complete, then libgsm, and then asterisk, for the Openvox, there is a chan-extra install script that does all those steps, but both install old 1.8 versions of Asterisk.

Is there any way to install new hardware without rebuilding from scratch?

Here is some extra info, the results of cat /proc/interrupts:

18: 1843540 0 IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb7, wctdm24xxp0

lspci -vvv:
05:00.0 Communication controller: Digium, Inc. Device b200 (rev 02)
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- SERR- <PERR- INTx-
Latency: 32
Interrupt: pin A routed to IRQ 11
Region 0: Memory at 90200000 (32-bit, non-prefetchable) [size=1K]

07:02.0 Ethernet controller: Digium, Inc. Wildcard TDM2400P 24-port analog card (rev 11)
Subsystem: Digium, Inc. Wildcard TDM2400P 24-port analog card
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- SERR- <PERR- INTx-
Latency: 32 (16000ns min, 32000ns max), Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 18
Region 0: I/O ports at 1000 [size=256]
Region 1: Memory at 90104800 (32-bit, non-prefetchable) [size=1K]
Expansion ROM at 91400000 [disabled] [size=128K]
Capabilities: [c0] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=100mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
Kernel driver in use: wctdm24xxp
Kernel modules: wctdm24xxp

I do not think the GSM cards work with new dahdi and freepbx, you have to patch self. Maybe you can take a loot at Sangoma GSM card: http://www.sangoma.com/products/w400-gsm-card/