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doc/Proto-SMSC-testing: document written
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 27 Aug 2023 21:47:19 -0800
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children 1c0773eba65e
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ce6bcb84ca30 doc/Proto-SMSC-testing: document written
Mychaela Falconia <falcon@freecalypso.org>
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1 The present code repository contains a proto-SMSC test framework: a pair of
ce6bcb84ca30 doc/Proto-SMSC-testing: document written
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2 programs that connect to OsmoHLR in the role of a GSUP-speaking SMSC and allow
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3 the rest of SMS-over-GSUP path to be exercised and tested.
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4
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5 To exercise SMS flow between an MS and the present proto-SMSC, set up your test
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6 environment as follows:
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8 0) Locate branch falconia/os6135 in osmo-hlr and osmo-msc git repositories;
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9 compile and run osmo-hlr and osmo-msc versions from this branch.
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11 1) Configure OsmoHLR to expect an SMSC at a certain IPA name, and to route
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12 MO SMS to this SMSC. Example config:
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14 hlr
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15 reject-cause not-found plmn-not-allowed
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16 reject-cause no-proxy net-fail
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17 gsup
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18 bind ip 127.0.0.1
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19 ipa-name Example-HLR
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20 ussd route prefix *#100# internal own-msisdn
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21 ussd route prefix *#101# internal own-imsi
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22 smsc entity Example-SMSC
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23 smsc route 19990014444 Example-SMSC
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24
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25 In this example the SMSC is operated at SC-address (fake Global Title)
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26 +19990014444 (a number falling into a reserved/invalid range in the North
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27 American Numbering Plan), with IPA name Example-SMSC, and you are configuring
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28 OsmoHLR to map this SC-address to this IPA name. SM-RP messages addressed to
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29 any other SMSC will be rejected - a user trying to send something to a
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30 commercial operator's SMSC will get an error during SMS send attempt, instead
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31 of her message being sneakily intercepted and diverted to Example-SMSC.
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32
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33 OTOH, if you prefer to operate your network in a guest roaming manner, allowing
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34 foreign SIMs without an actual roaming interconnection in place, and you wish
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35 to operate so that all such guest-roaming users will send their MO SMS to your
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36 SMSC while their phones "think" that they are addressing their native operator's
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37 SMSC, change the last line to:
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38
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39 smsc default-route Example-SMSC
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40
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41 2) Ensure that your OsmoMSC configuration includes the following bits:
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42
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43 msc
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44 sms-over-gsup
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45 hlr
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46 ipa-name Example-MSC
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48 The sms-over-gsup bit should be obvious, but the need for an explicitly set
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49 ipa-name is much less so. The explicitly set ipa-name doesn't matter for MO
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50 SMS, but it is needed for MT SMS to work. When an MT-forwardSM.req message
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51 arrives at the MSC from an SMSC, routed via OsmoHLR, the MSC will need to
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52 respond to it, and this response needs to reach the MT-sending SMSC. These
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53 responses are routed passively by OsmoHLR, and for this passive routing to work,
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54 the sender of the response message needs to include source_name IE. Thus
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55 explicitly set ipa-name for the MSC becomes a requirement, just like with
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56 inter-MSC handover.
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57
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58 3) Run proto-smsc-daemon like this:
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59
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60 proto-smsc-daemon Example-SMSC mo-sms-log /tmp/sendmt_socket
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61
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62 The first argument is the IPA name this proto-SMSC should give itself (needs to
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63 match OsmoHLR config), the second argument is the name of a log file that will
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64 be opened for writing, and the third argument is the pathname to which a local
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65 UNIX domain socket will be bound.
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66
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67 Any time an MS sends MO SMS to this proto-SMSC, the message will be written
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68 into the line-oriented log file which you named as the second argument to
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69 proto-smsc-daemon. Here is what messages will look like:
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70
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71 2023-08-25T23:53:01Z Rx MO SM
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72 IMSI: 310xxxxxxxxxxxx
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73 SM-RP-MR: 0x03
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74 SM-RP-DA: SMSC TON=1 NPI=1 1xxxxxxxxxx
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75 SM-RP-OA: MSISDN TON=1 NPI=1 1xxxxxxxxxx
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76 SM-RP-UI: 13 bytes
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77 010304814444000004D4F29C0E
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78
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79 ('x' characters in the above fragment are [0-9] digits in reality, but the
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80 numbers had to be redacted out for privacy, as the test was done on a live
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81 network that operates with real NANP phone numbers.)
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82
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83 The string of hex digits that makes up the final line of each recorded message
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84 is the GSM 03.40 SMS-SUBMIT TPDU that has been received from the MS in the
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85 SM-RP-UI field. proto-smsc-daemon writes it out in raw hex, but you can get a
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86 complete decoding by feeding this log file to sms-pdu-decode utility from
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87 freecalypso-tools Hg repository. You will need to run sms-pdu-decode with -n
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88 option so it will know not to expect a prepended SC-address in front of the TPDU
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89 (as happens in GSM 07.05), and you will need to compile from "bleeding edge" Hg
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90 code: the addition of this option has not made it into a release yet.
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91
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92 Running the above log fragment through sms-pdu-decode -np, we get the following
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93 decoding:
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94
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95 2023-08-25T23:53:01Z Rx MO SM
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96 IMSI: 310xxxxxxxxxxxx
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97 SM-RP-MR: 0x03
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98 SM-RP-DA: SMSC TON=1 NPI=1 1xxxxxxxxxx
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99 SM-RP-OA: MSISDN TON=1 NPI=1 1xxxxxxxxxx
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100 SM-RP-UI: 13 bytes
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101 010304814444000004D4F29C0E
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102
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103 First-Octet: 0x01
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104 MR: 0x03
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105 To: 4444 (type 0x81)
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106 PID: 0x00
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107 DCS: 0x00 (7-bit)
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108 Length: 4
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109
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110 Test
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111
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112 4) To test MT SMS, you will need to compile and install this additional sw
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113 package (very small):
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114
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115 https://www.freecalypso.org/hg/sms-coding-utils/
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116
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117 To send a test MT SMS, run a shell pipeline like the following:
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118
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119 sms-encode-text 'Message text blah blah' | gen-sms-deliver-pdu 1234 | proto-smsc-sendmt 19990014444 310999-001 /tmp/sendmt_socket
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120
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121 The various bits are:
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122
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123 * The argument to sms-encode-text is the human-level message body to be sent.
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124 One can also omit this command line argument and supply the message body on
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125 stdin instead.
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126
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127 * The argument to gen-sms-deliver-pdu is the "From" number to be inserted into
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128 the SMS-DELIVER TPDU being generated.
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129
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130 * The first argument to proto-smsc-sendmt is the SC-address to be transmitted
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131 in SM-RP-OA. This SMSC address is passed through to the MS, and savvy users
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132 of hacker-friendly MS can see it: it is written into SIM SMS storage which
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133 can then be read out and decoded, it can be retrieved via GSM 07.05, plus
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134 other MS-specific options like /pcm/SMS on Pirelli DP-L10 running that phone's
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135 original proprietary fw.
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136
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137 * The second argument to proto-smsc-sendmt is the IMSI to which the message
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138 should be sent. (Key point: MT SMS recipients in SMS-over-GSUP are addressed
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139 by IMSI, not by MSISDN!) proto-smsc-sendmt supports FreeCalypso shorthand
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140 notation for IMSI entry: 310999-001 in this example expands into
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141 310999000000001. Of course you can also enter the full IMSI manually, if you
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142 don't mind torturing your eyes counting all those zeros.
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143
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144 * The third argument to proto-smsc-sendmt is the local UNIX domain socket to
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145 which the composed GSUP message should be sent; it needs to match the socket
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146 pathname you gave to proto-smsc-daemon.