Call Routing in Huawei MSOFT
- 1. Description of different tables involved
- 2. Basic Concepts Call Source Call source refers to the subscriber or incoming trunk which initiate calls with the same call process attributes The call source name is obtained by checking the subscriber data table or trunk group table according to the calling subscriber or the incoming trunk group number. Route Selection Source Name (RSSN) It defines the category number of the routing policy for outgoing calls from the call source (local subscribers or incoming trunks). Same number prefix having different RSSN can be treated in different way i.e. can be routed to different routes. Definition: ADD CALLSRC, Use: ADD RTANA
- 3. Basic Concepts Route Selection Name (RSN) It defines a route selection strategy that the MSOFTX3000 uses to handle an outgoing call. Definition: ADD RTANA, Use: ADD CNACLD Combination of RSSN and RSN defines one RT RSN + RSSN RN
- 4. Relation of CALLSRC, Basic ConceptRSSN, RSN Incoming Call (BSC) LAIGCI Table LAIGCI Table RSSN = 0 Call Source, RSSN Call Prefix + RSSN CALLSRC CALLSRC (RSSN) (RSSN) (Call prefix-> RSN) (Call prefix-> RSN) Own / Other PLMN RSSN = 0, 10 RN Incoming Call RSSN + RSN Call Source, RSSN Trunk Group Trunk Group Table Table Call to selected Route (RN) CNACLD CNACLD RTANA RTANA (RSN) (RSN) Combination of (RSN, RSSN) selects a particular Route (RN) RSN + RSSN RN
- 5. Basic Concepts Important Features related to RSN, RSSN 1. 2. 3. Same prefix from different call source (with different RSSN) can be routed to different route. Call block from particular call source. Blocking Transit calls through BL network.
- 6. Same Call prefix to different Route Basic Concepts Using different RSSN for different Call source, one particular call prefix from different call source can be routed to different Routes. Use in BL network Switch: MGKL01 Scenario: One BL subscriber under coverage of Khulna MSC calls a BL subscriber at MGCT01. The call goes to TGDH01 and TGDH02 on 50-50 load share basis. But if a GP subscriber of Khulna calls a BL subscriber at MGCT01, the call is routed 50-50 load share to both Gateways.
- 7. Basic Concept Incoming Call Own PLMN Trunk Group Trunk Group Table Table CALLSRN = BSC TGDH01 TGDH01 TGDH02 TGDH02 RN=BL RSSN = 0 SRT2 Call Prefix CALLSRC CALLSRC Incoming Call SRT1 GGDH01 GGDH01 SR T2 CNACLD CNACLD GGDH02 GGDH02 RSSN + RSN RN=PLMN Trunk Group Trunk Group Table Table CALLSRN = GPKL01 RN Other PLMN SR T1 Same Call prefix to different Route RTANA RTANA (RSN) RSSN = 10 (RSN) Combination of (RSN, RSSN) selects a particular Route (RT) RSN + RSSN RT Call Source RSSN Call Prefix RSN RN BSC 0 019000207 BL_ROUTE BL GPKL01 10 019000207 BL_ROUTE PLMN
- 8. Basic Call Block from Particular Call Source Concepts Define the call source with a RSSN which is not used normally, for example, RSSN=5. In Route Analysis table (RTANA), there is no entry for RSSN = 5. So, no Route (RT) is selected and the call is dropped As no RT is selected, Incoming Call Other PLMN Trunk Group Trunk Group Table Table RSSN = 5 CALLSRC CALLSRC (RSSN) (RSSN) Call Prefix + RSSN = 5 CNACLD CNACLD call is dropped (Call prefix-> RSN) (Call prefix-> RSN) RSSN=5 + RSN GPDH01: IAM (Call Prefix) RTANA RTANA (RSN) (RSN) No Match for RSSN = 5 So, No Route is selected
- 9. Transit call: Call from one PLMN is going to another PLMN using BL network Blocking Transit call CALLSRN:MGDH07 BL VMSC is sending 018XX Call Prefix 018xxxxx CALLSRC CALLSRC CALLSRN:GPDH01 RSSN = 10 AKTEL Route Route No = 201 CNACLD CNACLD AKTEL RN Trunk Group Trunk Group Table Table GP is sending 018XX A party=017xxx B party=018xxx RSSN = 0 RSSN + RSN Trunk Group Trunk Group Table Table • BL Calls can pass through the RTANA table • Call From GP fails to pass RTANA due to different RSSN which is not defined in RTANA RTANA RTANA (RSN) (RSN) Call Source RSSN Call Prefix RSN Route MGDH07 0 018 AKTEL_ROUTE AKTEL If we define RSSN 10 for RSN AKTEL_ROUTE, transit call will pass to AKTEL Lesson: Outgoing Routes to other PLMN should only pass RSSN=0
- 10. MSRN MSRN Routes Routes are used to pass MSRN. own PLMN and other PLMN. MSRN Routes should be accessible for For own PLMN RSSN=0, for Other PLMN RSSN=10. Perform RTANA for both RSSN=0 & 10. BL Subscriber dials 019XX I SR MGDH07 GP is sending 019XX A party=017xxx B party=019xxx PR N HLR IAM Route: B L MGCT01 Call from own PLMN and other PLMN should pass MSRN Routes Two entries are required in RTANA Call Source RSSN Call Prefix RSN Route BSC 0 019000207 BL_ROUTE BL GPKL01 10 019000207 BL_ROUTE BL If RTANA for RSSC 10 is not defined in MSRN Route, call from Other PLMN to that VMSC fails
- 11. One BL subscriber from Khulna Same MSRN to Different MSC: goes directly viaVMSC calls a BL subscriber of MGCT01. The call Example MGCT01 But if a GP subscriber of Khulna calls a BL subscriber of MGCT01, the call is routed 50-50 load share to both Tandem MSC BL Subscriber dials 019XX RSN = BL_ROUTE Route = MGCT01 SRT = MGCT01 MGKL01 MGCT01 RSN = BL_ROUTE RSN = BL_ROUTE Route = PLMN Route = PLMN HLR interrogation GP subscriber call BL A party=017xxx B party=019xxx SRT=GGDH01 SRT=GGDH02 HLR GGDH01 GGDH02 Analysis Table Call Source RSSN (BSC) 0 (GP) 10 Call Prefix RSN 8801900207 BL_ROUTE Route Subroute-1 Subroute-2 MGCT01 MGCT01 X PLMN TGDH01 TGDH01