Hello,
 
  I'm using OpenBTS 2.5.4 . And I'd like to use SMS.HTTP.Gateway . But I don't any tryings...
My config:
SMS.HTTP.AccessString: sendmsg?user=test&password=test123&api_id=123
SMS.HTTP.Gateway: 192.168.5.142
Log:

OpenBTS> 1272290216.2712 INFO 3068566384 RadioResource.cpp:152:AccessGrantResponder: RA=0xe2 when=0:105393 age=28 TOA=1.0000
1272290216.2713 INFO 3068566384 GSMLogicalChannel.cpp:42:open:
1272290216.2714 INFO 3068566384 GSMLogicalChannel.cpp:42:open:
1272290216.2716 INFO 3068566384 RadioResource.cpp:207:AccessGrantResponder: sending PageMode=(0) DedicatedModeOrTBF=(TMA=0 Downlink=0 DMOrTBF=0) ChannelDescription=(typeAndOffset=SDCCH/4-0 TN=0 TSC=0 ARFCN=513) RequestReference=(RA=226 T1'=15 T2=15 T3=27) TimingAdvance=1
1272290216.5674 INFO 3066436464 GSML3Message.cpp:162:parseL3: L3 recv MM CM Service Request serviceType=SMS mobileIdentity=(TMSI=0x4bd59a43)
1272290216.5675 INFO 3066436464 MobilityManagement.cpp:59:CMServiceResponder: MM CM Service Request serviceType=SMS mobileIdentity=(TMSI=0x4bd59a43)
1272290216.5675 INFO 3066436464 SMSControl.cpp:306:MOSMSController: MOSMS, req MM CM Service Request serviceType=SMS mobileIdentity=(TMSI=0x4bd59a43)
1272290216.5676 INFO 3066436464 SMSControl.cpp:332:MOSMSController: sending CMServiceAccept
1272290216.5676 INFO 3066436464 GSMLogicalChannel.cpp:76:send: L3 SAP0 sending MM CM Service Accept
1272290218.6823 INFO 3066436464 SMSControl.cpp:352:MOSMSController: sending CPAck
1272290218.9566 INFO 3066436464 SMSControl.cpp:366:MOSMSController: CPData CP-DATA TI=(0,7) RPDU=(0001000891683108603605f01511880b817360741286f300000b07d4f29c9e769f01)
1272290218.9568 INFO 3066436464 SMSControl.cpp:285:handleRPDU: SMS RP-DATA 0 ref=1 origSMSC=(type=unknown plan=unknown digits=) destSMSC=(type=international plan=E.164/ISDN digits=8613800663500) TPDU=(primitive=undefined  data=(11880b817360741286f300000b07d4f29c9e769f01))
1272290218.9568 INFO 3066436464 SMSControl.cpp:262:handleTPDU: SMS SMS-SUBMIT 1 RD=0 VPF=2 RP=0 UDHI=0 SRR=0 MR=136 DA=(type=unknown plan=E.164/ISDN digits=37064721683) PI=0 DCS=0 VP=(expiration=(Mon Apr 26 07:56:58 2010)) UD="Testing"
1272290218.9569 INFO 3066436464 SMSControl.cpp:217:submitSMS: from IMSI=460029179918532
1272290218.9571 INFO 3066436464 SMSControl.cpp:172:sendToNumericAddress: from IMSI=460029179918532 mesage: 1 RD=0 VPF=2 RP=0 UDHI=0 SRR=0 MR=136 DA=(type=unknown plan=E.164/ISDN digits=37064721683) PI=0 DCS=0 VP=(expiration=(Mon Apr 26 07:56:58 2010)) UD="Testing"
sh: Syntax error: Bad fd number
1272290218.9619 INFO 3066436464 SMSControl.cpp:386:MOSMSController: sending RPAck in CPData
1272290222.4969 NOTICE 3066436464 SMSControl.cpp:399:MOSMSController: unexpected SMS CP message1
1272290222.4971 NOTICE 3066436464 DCCHDispatch.cpp:144:DCCHDispatcher: UnexpectedMessage
1272290222.4972 INFO 3066436464 GSMLogicalChannel.cpp:76:send: L3 SAP0 sending RR Channel Release cause=0x62

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Best Regards,
Giedrius