| % ITU-T Q.76x ISUPcoding / decoding |
| |
| % (C) 2011 by Harald Welte <laforge@gnumonks.org> |
| % |
| % All Rights Reserved |
| % |
| % This program is free software; you can redistribute it and/or modify |
| % it under the terms of the GNU Affero General Public License as |
| % published by the Free Software Foundation; either version 3 of the |
| % License, or (at your option) any later version. |
| % |
| % This program is distributed in the hope that it will be useful, |
| % but WITHOUT ANY WARRANTY; without even the implied warranty of |
| % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| % GNU General Public License for more details. |
| % |
| % You should have received a copy of the GNU Affero General Public License |
| % along with this program. If not, see <http://www.gnu.org/licenses/>. |
| |
| -module(isup_codec). |
| -author('Harald Welte <laforge@gnumonks.org>'). |
| -include("isup.hrl"). |
| |
| -export([parse_isup_msg/1, encode_isup_msg/1]). |
| |
| % References to 'Tabe C-xxx' are to Annex C of Q.767 |
| |
| % Default case: no fixed and no variable parts, only options |
| % ANM, RLC, FOT |
| parse_isup_msgt(M, Bin) when |
| M == ?ISUP_MSGT_ANM; |
| M == ?ISUP_MSGT_RLC; |
| M == ?ISUP_MSGT_FOT; |
| parse_isup_opts(Bin); |
| % Table C-5 Address complete |
| parse_isup_msgt(?ISUP_MSGT_ACM, Bin) -> |
| <<BackCallInd:16, Remain/binary>> = Bin, |
| BciOpt = {backward_call_ind, BackCallInd}, |
| Opts = parse_isup_opts(Remain) |
| [BciOpt|Opts]; |
| % Table C-7 Call progress |
| parse_isup_msgt(?ISUP_MSGT_CPG, Bin) -> |
| <<EventInf:8, Remain/binary>> = Bin, |
| BciOpt = {event_info, EventInf}, |
| Opts = parse_isup_opts(Remain) |
| [BciOpt|Opts]; |
| % Table C-9 Circuit group reset acknowledgement |
| parse_isup_msgt(?ISUP_MSGT_GRA, Bin) -> |
| % V: Range and status |
| |
| % Table C-11 Connect |
| parse_isup_msgt(?ISUP_MSGT_CON, Bin) -> |
| <<BackCallInd:16, Remain/binary>> = Bin, |
| BciOpt = {backward_call_ind, BackCallInd}, |
| Opts = parse_isup_opts(Remain) |
| [BciOpt|Opts]; |
| % Table C-12 Continuity |
| parse_isup_msgt(?ISUP_MSGT_COT, Bin) -> |
| <<ContInd:8>> = Bin, |
| [{continuity_ind, ContInd}]; |
| % Table C-16 Initial address |
| parse_isup_msgt(?ISUP_MSGT_IAM, Bin) -> |
| <<CINat:8, FwCallInd:16/big, CallingCat:8, TransmReq:8, VarAndOpt/binary>> = Bin, |
| FixedOpts = [{conn_ind_nature, CINat}, {fw_call_ind, FwCallInd}, {calling_cat, CallingCat}, |
| {transm_medium_req, TransmReq}], |
| % V: Called Party Number |
| VarOpts = FIXME; |
| Opts = parse_isup_opts(Remain), |
| [FixedOpts,VarOpts,Opts]; |
| % Table C-17 Release |
| parse_isup_msgt(?ISUP_MSGT_REL, Bin) -> |
| % V: Cause indicators |
| VarOpts = FIXME; |
| Opts = parse_isup_opts(Remain), |
| [VarOpts,Opts]; |
| % Table C-19 Subsequent address |
| parse_isup_msgt(?ISUP_MSGT_SAM, Bin) -> |
| % V: Subsequent number |
| VarOpts = FIXME; |
| Opts = parse_isup_opts(Remain), |
| [VarOpts,Opts]; |
| % Table C-21 Suspend, Resume |
| parse_isup_msgt(Msgt, Bin) when Msgt == ?ISUP_MSGT_RES or Msgt == ?ISUP_MSGT_SUS -> |
| <<SuspResInd:8, Remain/binary>> = Bin, |
| FixedOpts = [{susp_res_ind, SuspResInd}], |
| Opts = parse_isup_opts(Remain), |
| [FixedOpts|Opts]; |
| % Table C-23 |
| parse_isup_msgt(M, <<>>) when |
| M == ?ISUP_MSGT_BLO; |
| M == ?ISUP_MSGT_BLA; |
| M == ?ISUP_MSGT_CCR; |
| M == ?ISUP_MSGT_RSC; |
| M == ?ISUP_MSGT_UBL; |
| M == ?ISUP_MSGT_UBA -> |
| []. |
| % Table C-25 |
| parse_isup_msgt(M, Bin) when |
| M == ?ISUP_MSGT_CGB; |
| M == ?ISUP_MSGT_CGBA; |
| M == ISUP_MSGT_CGU; |
| M == ISUP_MSGT_CGUA -> |
| <<CGMsgt:8, VarBin/binary>> = Bin, |
| FixedOpts = [{cg_supv_msgt, CGMsgt}], |
| % V: Range and status |
| VarOpts = FIXME, |
| [FixedOpts|VarOpts]; |
| % Table C-26 Circuit group reset |
| parse_isup_msgt(?ISUP_MSGT_GRS, Bin) -> |
| % V: Range without status |
| VarOpts = FIXME, |
| VarOpts. |
| |
| |
| parse_isup_msg(Databin) when is_binary(DataBin) -> |
| <<0:4, Cic:12/big, MsgType:8, Remain/binary>> = DataBin, |
| Opts = parse_isup_msgt(MsgType, Remain), |
| #isup_msg{cic = Cic, msg_type = MsgType, parameters = Opts}. |