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Internal - داخلی stc stc Reference Offer (RO) Annex C, Attachment 3 Saudi Arabia SS7 Signalling Standard (SA-ISUP & MTP) <table><tr><td>Version number :</td><td>Final Version</td></tr><tr><td>Version date :</td><td>Oct. 2025</td></tr><tr><td>Date of original Issue:</td><td>10thDecember 2018</td></tr><tr><td>Authority for issue :</td><td>GM, Commercial Regulation</td></tr></table> Internal - داخلی Internal - داخلی stc Document History & Version Control Record <table><tr><td>Name of document</td><td>Annex C, Attachment 3 Signalling</td></tr><tr><td>Author</td><td>Director, Regulatory WBU</td></tr><tr><td>Authorised Officer</td><td>GM, Commercial Regulation</td></tr><tr><td>Description of document</td><td>Contains information about Saudi Arabia SS7 Signalling Standard</td></tr><tr><td>Approved by</td><td>CST</td></tr></table> <table><tr><td>Version No.</td><td>Version Date</td><td>Authorised Officer</td><td>Amendment Details</td></tr><tr><td>1.0</td><td>December, 2018</td><td>GM, Regulatory Affairs</td><td></td></tr><tr><td>2.0</td><td>March, 2020</td><td>GM, Commercial Regulation</td><td></td></tr><tr><td>3.0</td><td>January, 2022</td><td>GM, Commercial Regulation</td><td></td></tr><tr><td>4.0</td><td>November, 2022</td><td>GM, Commercial Regulation</td><td></td></tr><tr><td>5.0</td><td>October, 2025</td><td>GM, Commercial Regulation</td><td></td></tr></table> stc Reference Offer - Annex C, Attachment 3 Final Version Page 2 of 14 Oct. 2025 Internal - داخلي Internal - داخلی - stc Table of Contents 1 Saudi Arabia SS7 Signalling Standard....4 2 Saudi Arabian ISUP (SA-ISUP) 4 3 Signalling Network Structure....10 4 Testing and Maintenance....10 5 Performance Requirements....10 6 Monitoring & Measurements for SS7 Network....11 7 MTP Requirements for Interconnection ....11 stc Reference Offer - Annex C, Attachment 3 Final Version Page 3 of 14 Oct. 2025 Internal - داخلي Internal - داخلی stc 1 Saudi Arabia SS7 Signalling Standard 1.1 General Telephony-related signalling is provided via the Integrated Services Digital Network User Part (ISUP) of the Signalling System No. 7 (SS7) signalling network. The specifications for the SS7 ISUP protocols consist of the corresponding ITU-T and ETSI Recommendations, with clarification where the recommendations indicate implementation alternatives or are unclear. stc only uses SS7, consisting of the Message Transfer Part (MTP) and ISUP, for interconnection with Other Licensed Operators. The specifications for the Saudi Arabia SS7 Signalling Network are as per the appropriate sections of the ITU-T recommendations Q.701 to Q.709, except where modified by statements in this document. 2 Saudi Arabian ISUP (SA-ISUP) 2.1 Introduction This section specifies the PSTN basic and supplementary services to be supported by SA-ISUP for the national Network. The implementation of these services shall be based on relevant CCITT/ITU-T recommendations or ETSI specification, to facilitate the interworking of exchange equipment from different vendors. Where the relevant standards have been adapted for Saudi Arabia, the Other Licensed Operator shall be prepared to make subsequent modifications to interwork with the stc network, as will be agreed to by the Technical Review Committee, described in Annex H (Operations and Maintenance Manual). 2.2 Scope This Standard provides the PICS proforma (Protocol Implementation Conformance Statement) for the ISDN User Part implemented in the national network, called SA-ISUP, supporting ISDN and PSTN basic and supplementary services for voice and non-voice stc Reference Offer - Annex C, Attachment 3 Final Version Page 4 of 14 Oct. 2025 Internal - داخلي Internal - داخلی stc applications. The SA-ISUP and MTP PICS proforma is based on functional rather than detailed requirements. The OLO shall indicate the compliance of their ISUP implementation to the Saudi Arabian ISUP functional requirements by completing the SA-ISUP PICS proforma provided in Clause 2.4 below. Final Version stc Reference Offer - Annex C, Attachment 3 Page 5 of 14 Oct. 2025 Internal - داخلی Internal - iguay stc 2.3 SA-ISUP SERVICE SUPPORT This section specifies the PSTN basic and supplementary services to be supported by SA-ISUP for the national Network. The following services shall be supported: PSTN Supplementary Services: ○ Calling Line Identification Presentation (Clause 3 of Q.731) ○ Restriction in the outgoing direction service (ITU-T fascicle II-2 Supp) ○ Incoming call barring (Sec. 1.10, ITU-T fascicle II-2 Supp) ○ 3-party services (Sec. 1.15, ITU-T fascicle II-2 Supp) ○ Malicious call identification services (Sec.1.6, ITU-T fascicle II-2 Supp) ○ Payphone service (Sec. 1.1, ITU-T fascicle II.2 Supp) ○ Freephone service (Sec. 1.5, ITU-T fascicle II-2 Supp) ○ Call waiting services (Sec. 2.23, ITU-T fascicle II-2 Supp) ○ Call Forwarding Busy (ETS 300199) ○ Call Forwarding No Reply (ETS 300201) ○ Call Forwarding Unconditional (ETS 300200) stc Reference Offer - Annex C, Attachment 3 Final Version Page 6 of 14 Oct. 2025 Internal - داخلي Internal - داخلی stc 2.4 SA-ISUP functional Requirements <table><tr><td>No</td><td>Item</td><td>Status</td><td>References</td><td>Support</td><td>Note</td></tr><tr><td>1</td><td>Normal call setup, enbloc and overlap operation</td><td>m</td><td>Q.764/2.1</td><td></td><td></td></tr><tr><td>2</td><td>Connection types allowed:1. Speech2. 64 kbit/s unrestricted</td><td>m m</td><td>Q.764/2.1</td><td></td><td></td></tr><tr><td>3</td><td>Continuity check</td><td>m</td><td>Q.764/2.1.8</td><td></td><td></td></tr><tr><td>4</td><td>Special procedures at interworking pointTransit network selection</td><td>m</td><td>Q.764/2.1.9Q.764/2.1.11</td><td></td><td></td></tr><tr><td>5</td><td>Cross office check</td><td>m</td><td>Q.764/2.1.10</td><td></td><td></td></tr><tr><td>6</td><td>Charging</td><td>m</td><td>Q.764/2.1.9</td><td></td><td></td></tr><tr><td>7</td><td>Unsuccessful call set-up and normal call release, including returned tones and announcements</td><td>m</td><td>Q.764/2.2, 2.3</td><td></td><td></td></tr><tr><td>8</td><td>Suspend & resume</td><td>m</td><td>Q.764/2.4</td><td></td><td></td></tr><tr><td>9</td><td>Propagation delay termination procedure</td><td>o</td><td>Q.764/2.6</td><td></td><td></td></tr><tr><td>10</td><td>Automatic repeat attempt</td><td>m</td><td>Q.764/2.8.1</td><td></td><td></td></tr><tr><td>11</td><td>Blocking and unblocking of circuits and circuit groups</td><td>m</td><td>Q.764/2.8.2</td><td></td><td></td></tr><tr><td>12</td><td>Dual seizure</td><td>m</td><td>Q.764/2..9.1</td><td></td><td></td></tr><tr><td>13</td><td>Transmission alarm handling for digital inter-exchange circuits</td><td>m</td><td>Q.764/2..9.2</td><td></td><td></td></tr><tr><td>14</td><td>Reset of circuits and circuit groups</td><td>m</td><td>Q.764/2.9.3</td><td></td><td></td></tr><tr><td>15</td><td>Failure in blocking/unblocking sequences</td><td>m</td><td>Q.764/2.9.4</td><td></td><td></td></tr><tr><td>16</td><td>Receipt of unreasonable and unrecognised signalling information messages</td><td>m</td><td>Q.764/2.9.5</td><td></td><td></td></tr><tr><td>17</td><td>Failure to receive a release complete message</td><td>m</td><td>Q.764/2.9.6</td><td></td><td></td></tr><tr><td>18</td><td>Other failure conditions</td><td>m</td><td>Q.764/2.9.8</td><td></td><td></td></tr><tr><td>19</td><td>Temporary trunk blocking before release</td><td>m</td><td>Q.764/2.9.9</td><td></td><td></td></tr><tr><td>20</td><td>ISUP signalling congestion control</td><td>m</td><td>Q.764/2.10</td><td></td><td></td></tr></table> stc Reference Offer - Annex C, Attachment 3 Final Version Page 7 of 14 Oct. 2025 Internal - داخلي Internal - داخلی - stc <table><tr><td>21</td><td>Automatic congestion control (ACC)</td><td>m</td><td>Q.764/2.11</td><td></td><td></td></tr><tr><td>22</td><td>Unequipped circuit identification code</td><td>m</td><td>Q.764/2.12</td><td></td><td></td></tr></table> Final Version stc Reference Offer - Annex C, Attachment 3 Page 8 of 14 Oct. 2025 Internal - داخلی Internal - داخلی stc 2.5 Calling Party Categories (in line with ITU-T Q.763): <table><tr><td>Item Name</td><td>Value</td></tr><tr><td>Category unknown at this time</td><td>0</td></tr><tr><td>Reserved</td><td>1 - 8</td></tr><tr><td>National operator</td><td>9</td></tr><tr><td>Ordinary subscriber (International)</td><td>10</td></tr><tr><td>Subscriber with priority</td><td>11</td></tr><tr><td>Data call</td><td>12</td></tr><tr><td>Test call (maintenance equipment)</td><td>13</td></tr><tr><td>Spare</td><td>14</td></tr><tr><td>Payphone</td><td>15</td></tr><tr><td>Ordinary subscriber (National)</td><td>246</td></tr><tr><td>Calling subscriber with priority (National)</td><td>247</td></tr><tr><td>Data call (National voice band data)</td><td>248</td></tr><tr><td>International Coin Box</td><td>249</td></tr><tr><td>Call cabins & hotel metering subscribers</td><td>250</td></tr><tr><td>Interception service operator</td><td>251</td></tr><tr><td>Calls transferring subscriber</td><td>252</td></tr><tr><td>Spare</td><td>253</td></tr><tr><td>Mobile subscriber</td><td>254</td></tr><tr><td>all other values</td><td>---</td></tr></table> stc Reference Offer - Annex C, Attachment 3 Final Version Page 9 of 14 Oct. 2025 Internal - داخلي Internal - داخلی - stc 2.6 cause identifiers (in line with ITU-T Q.850) 3 Signalling Network Structure 3.1 The signalling network shall be structured as described in ITU-T Recommendation Q.705 as per Figure 8 of this Annex C. Only OLO's STPs will directly connect to stc national STPs. 3.2 Signalling point numbering of the POI Service Nodes is shown in Annex C, Attachment 2 (Points of Interconnection & Signalling Point Codes (POIs & SPCs)). 3.3 Numbering of the Other Licensed Operator's signalling point codes will follow the signalling numbering scheme as per the CST plan. 4 Testing and Maintenance 4.1 Maintenance of the interconnection signalling links between the Other Licensed Operator and stc Networks shall generally follow the guidelines of ITU-T Recommendation M.4100. 4.2 The Other Licensed Operator shall support capability of performing the MTP and ISUP compatibility test requirements extracted from ITU-T Recommendations Q.780, Q.781, Q.782, Q.784 and Q.785. 5 Performance Requirements 5.1 The Performance Requirements for the implementation of SS7 shall be as described in the following: a) Q.706: Message Transfer Part Signalling Performance b) Q.709: Hypothetical Signalling Reference Connection c) Q.766: Performance Objectives in the ISDN Application d) ETS 300 008: Section 6.1 Signalling Link Loading stc Reference Offer - Annex C, Attachment 3 Final Version Page 10 of 14 Oct. 2025 Internal - داخلي Internal - داخلی stc 6 Monitoring & Measurements for SS7 Network 6.1 The signalling network measurement requirements shall be extracted from ITU-T Recommendation Q.752. These requirements shall be discussed with the Other Licensed Operator. The Other Licensed Operator shall be prepared to provide a list of the measurements that are supported by their SS7 signalling network equipment, and to implement any additional measurements that are necessary. 7 MTP Requirements for Interconnection 7.1 General The requirements for Interconnection are provided in the tables of Section 7.2 below, and consist of the appropriate sections of the ITU-T Recommendations Q.702, Q.703 and Q.704 with ETSI-based modifications in some sections, as indicated. 7.2 MTP protocol requirements Level 1 - Signalling Data Link <table><tr><td>No</td><td>Item</td><td>Status</td><td>Reference: Q.702</td><td>Support</td><td>Note</td></tr><tr><td>1</td><td>Digital SDL at 64 Kbit/s, derived from a digital multiplexed signal at 2048 Kbit/s</td><td>m</td><td>1, 2, 3, 4 & 5</td><td></td><td>1</td></tr><tr><td>2</td><td>Terrestrial & satellite transmission links</td><td>m</td><td>1.5</td><td></td><td></td></tr><tr><td>3</td><td>Exclusive use of SDL for S.S.7</td><td>m</td><td>1.6</td><td></td><td></td></tr><tr><td>4</td><td>Disabling echo suppressors, etc. to ensure transmission bit integrity</td><td>m</td><td>1.7</td><td></td><td></td></tr><tr><td>5</td><td>Switching Matrix semi-permanent connection</td><td>m</td><td>1.8</td><td></td><td></td></tr></table> Note 1: The exchange shall also have the capability to use timeslot 1 for signalling. stc Reference Offer - Annex C, Attachment 3 Final Version Page 11 of 14 Oct. 2025 Internal - داخلي Internal - داخلی stc Level 2 - Signalling Link <table><tr><td>No</td><td>Item</td><td>Status</td><td>Reference: Q.703</td><td>Support</td><td>Note</td></tr><tr><td>1</td><td>Basic Signal Unit Format, Delimitation</td><td>m</td><td>2, 3</td><td></td><td>1, 2</td></tr><tr><td>2</td><td>Signal Unit Acceptance, Error Detection</td><td>m</td><td>1.3, 4</td><td></td><td></td></tr><tr><td>3</td><td>Basic and PCR Error Correction</td><td>m</td><td>1.4, 5, 6</td><td></td><td>3, 4</td></tr><tr><td>4</td><td>Initial Alignment</td><td>m</td><td>7</td><td></td><td></td></tr><tr><td>5</td><td>Processor Outage</td><td>m</td><td>8</td><td></td><td>5</td></tr><tr><td>10</td><td>Level 2 Flow Control</td><td>m</td><td>9</td><td></td><td></td></tr><tr><td>11</td><td>Signalling Link Error Monitoring</td><td>m</td><td>10</td><td></td><td>6</td></tr><tr><td>12</td><td>Level 2 Codes and Priorities</td><td>m</td><td>11</td><td></td><td></td></tr><tr><td>13</td><td>State Transition Diagrams and Timers</td><td>m</td><td>12</td><td></td><td></td></tr></table> Note 1: Q.703 Section 2.3.4 SIO: All User Parts shall be handled with the same priority. Note 2: The maximum number of flags to be transmitted between two signalling units shall be 32. Note 3: The guidelines in 1.4.1 shall be used to decide the method of error correction. The type of error correction shall be command settable on a per link or linkset basis. Note 4: Q.703 Section 5.3.3 Repetition of MSUs: This sub-section is not applicable. Note 5: Q.703 Section 8 Processor Outage: For long-term Processor Outages, the procedures described in ETS 300 008 Section 5 for "Processor Outage" shall be applicable. Note 6: In order to maintain satisfactory operation over radio systems subject to fading, the parameters defining the SUERM/AERM shall be changeable on a per link basis. It shall be possible to activate by command a secondary set of parameters for selected signalling links. stc Reference Offer - Annex C, Attachment 3 Final Version Page 12 of 14 Oct. 2025 Internal - داخلي Internal - داخلی stc Level 3 - Signalling Network Functions and Messages <table><tr><td>No</td><td>Item</td><td>Status</td><td>Reference: Q.704</td><td>Support</td><td>Note</td></tr><tr><td>1</td><td>Signalling Message Handling</td><td>m</td><td>2</td><td></td><td>1</td></tr><tr><td>2</td><td>Status of signalling link and status change procedures</td><td>m</td><td>3.2, 3.3</td><td></td><td>2</td></tr><tr><td>3</td><td>Status of signalling routes and status change procedures</td><td>m</td><td>3.4, 3.5</td><td></td><td>3</td></tr><tr><td>4</td><td>Status of signalling point and status change procedures</td><td>m</td><td>3.6, 3.7</td><td></td><td></td></tr><tr><td>5</td><td>Congestion status of signalling link</td><td>m</td><td>3.8.2</td><td></td><td></td></tr><tr><td>6</td><td>Procedures used in connection with link congestion status changes</td><td>m</td><td>3.8.2</td><td></td><td>4</td></tr><tr><td>7</td><td>Signalling route set congestion</td><td>m</td><td>3.8.4, 3.8.5</td><td></td><td></td></tr><tr><td>8</td><td>Signalling Traffic Management</td><td>m</td><td>4</td><td></td><td>3</td></tr><tr><td>9</td><td>Changeover</td><td>m</td><td>5</td><td></td><td>5</td></tr><tr><td>10</td><td>Changeback</td><td>m</td><td>6</td><td></td><td></td></tr><tr><td>11</td><td>Forced Rerouting</td><td>m</td><td>7</td><td></td><td></td></tr><tr><td>12</td><td>Controlled Rerouting</td><td>m</td><td>8</td><td></td><td>3</td></tr><tr><td>13</td><td>Signalling Point Restart</td><td>m</td><td>9</td><td></td><td></td></tr><tr><td>14</td><td>Management Inhibiting</td><td>m</td><td>10</td><td></td><td></td></tr><tr><td>15</td><td>Signalling Traffic Flow Control- Signalling route set unavailability, availability- Signalling route set congestion (national option with congestion priorities)- SP/STP congestion- User flow control</td><td>m m m m</td><td>11.2.1, 11.2.2 11.2.4 11.2.6 11.2.7</td><td></td><td></td></tr></table> stc Reference Offer - Annex C, Attachment 3 Final Version Page 13 of 14 Oct. 2025 Internal - داخلي Internal - iguay stc <table><tr><td>16</td><td>Signalling Link Management- Basic signalling link management procedures</td><td>m</td><td>12 12.2</td><td></td><td>6</td></tr><tr><td>17</td><td>Signalling Route Management- Transfer prohibited- Transfer allowed- Signalling route set test- Transfer controlled (national option with congestion priorities)- Signalling route set congestion test</td><td>mm m m m m</td><td>13 13.2 13.3 13.5 13.7 13.9</td><td></td><td>3</td></tr><tr><td>18</td><td>MSU formats</td><td>m</td><td>14, 15</td><td></td><td>3, 7, 8</td></tr><tr><td>19</td><td>State Transition Diagrams & Timers</td><td>m</td><td>16</td><td></td><td>3, 7, 9</td></tr></table> Note 1: The standard routing label specified in 2.2 is used in the national network as well. Note 2: LPO latching to RPO before performing changeover (Q.704, 3.3.5.1 national option) is not applicable. Note 3: Restricted routes and associated messages and procedures are not applicable. Note 4: The congestion thresholds shall be set on a per linkset basis and shall be changeable by command. Note 5: Q.704 Section 5 Changeover: The section in ETS 300 008 Section 5 referring to "Time - controlled changeover" shall be added to section 5.6.2. Note 6: The links in a linkset are all part of the same link group. All links in a link set are of equal priority. Note 7: Signalling-data-link-connection messages and procedures are not applicable. Note 8: The spare-bits of the SIO field shall be used to indicate message priority. Note 9: Tenderers shall indicate the range of Level 3 timers they support and if such timers are permanent parameters or command adaptable (either on a per route or on a per node basis). The preferred level 3 timer values are given in Q.704, section 16.8. stc Reference Offer - Annex C, Attachment 3 Final Version Page 14 of 14 Oct. 2025 Internal - داخلي