ROuting Analysis

8/13/2019 ROuting Analysis

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Description of different tables involved


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Basic ConceptsCall 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 outgoingcallsfrom the call source(local subscribers or incoming trunks).

Same number prefix having different RSSN can be treated indifferent way i.e. can be routed to different routes.

Definition: ADD CALLSRC, Use: ADD RTANA


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Basic ConceptsRoute 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 + RSSNRN


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Basic Concept

Trunk GroupTable

CALLSRC(RSSN)

Incoming Call

Own / Other PLMN

LAIGCI Table

Call Source, RSSN

Incoming Call (BSC) RSSN = 0

RSSN = 0, 10

Call Source, RSSN

CNACLD(Call prefix-> RSN)

Call Prefix +RSSN

RTANA(RSN)

Combination of (RSN, RSSN)selects a particular Route (RN)

RSN + RSSN RN

Call to selected Route (RN)

RSSN

+RSN R

N

Relation of CALLSRC, RSSN, RSN


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Basic Concepts

Important Features related to RSN, RSSN

1. Same prefix from different call source (with different RSSN) can be routed to different

route.2. Call block from particular call source.

3. Blocking Transit calls through BL network.


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Basic Concepts

Same Call prefix to different Route

Using different RSSN for different Call source, one particular call prefixfrom different call source can be routed to different Routes.

Use in BL networkSwitch: MGKL01

Scenario: One BL subscriber under coverage of Khulna MSC calls a BLsubscriber at MGCT01. The call goes to TGDH01 and TGDH02 on 50-50load share basis.

But if a GP subscriber of Khulna calls a BL subscriber at MGCT01, the callis routed 50-50 load share to both Gateways.


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Basic Concept

Call Source RSSN Call Prefix RSN RN

BSC 0 019000207 BL_ROUTE BL

GPKL01 10 019000207 BL_ROUTE PLMN

Incoming Call

OtherPLMN

Trunk GroupTable

CALLSRC

Trunk GroupTable

CALLSRN = BSC

RSSN = 0

CALLSRN = GPKL01

RSSN = 10

Call Prefix

Combination of (RSN, RSSN)selects a particular Route (RT)

RSN + RSSN RT

CNACLD

RTANA(RSN)

RSSN

+RSN

RN

Same Call prefix to different RouteIncoming Call

OwnPLMN

GGDH01

GGDH02

RN=PLMN

TGDH01

TGDH02RN=BL

SRT2


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Basic ConceptsCall Block from Particular Call Source

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 selectedand the call is dropped

CNACLD(Call prefix-> RSN)

Call Prefix +RSSN = 5

RTANA(RSN)

No Match for RSSN = 5

So, No Route is selected

As no RT is selected,

call is dropped

RSSN=5

+R

SN

Trunk GroupTable

CALLSRC(RSSN)

Incoming Call

Other PLMN RSSN = 5

GPDH01: IAM (Call Prefix)


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Blocking Transit call

GP is sending 018XXA party=017xxxB party=018xxx

Call Source RSSC Call Prefix RSC Route

115 (VMSC) 0 018 201 201

Trunk GroupTable

CALLSRC

Trunk GroupTable

CALLSRN:MGDH07

RSSN = 0

CALLSRN:GPDH01

RSSN = 10

Call Prefix018xxxxx

CNACLD

RTANA(RSN)

RSSN

+RSN

RN

BL VMSC is

sending 018XX

AKTELAKTEL RouteRoute No = 201

BL Calls can pass through theRTANA tableCall From GP fails to passRTANA due to different RSSNwhich is not defined in RTANA

If we define RSSN 10 for RSN AKTEL_ROUTE, transit call will passto AKTEL

Transit call: Call from one PLMN is going to another PLMN using BL network

Lesson: Outgoing Routes to other PLMN should only pass RSSN=0

Call Source RSSN Call Prefix RSN Route

MGDH07 0 018 AKTEL_ROUTE AKTEL


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MSRN Routes

If RTANA for RSSC 10 is not defined in MSRN Route, call from Other PLMN to that VMSC fails

GP is sending 019XXA party=017xxxB party=019xxx

BL Subscriberdials 019XX

Call from own PLMN and other PLMNshould pass MSRN Routes

Two entries are required in RTANA

MGDH07

HLR

MGCT01

MSRN Routes are used to pass MSRN.MSRN Routes should be accessible for own PLMN and other PLMN.For own PLMN RSSN=0, for Other PLMN RSSN=10.Perform RTANA for both RSSN=0 & 10.

Call Source RSSN Call Prefix RSN Route

BSC 0 019000207 BL_ROUTE BL

GPKL01 10 019000207 BL_ROUTE BL


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Same MSRN to Different MSC: Example

Call Source RSSN Call Prefix RSN Route Subroute-1 Subroute-2

(BSC) 08801900207 BL_ROUTE

MGCT01 MGCT01 X

(GP) 10 PLMN TGDH01 TGDH01

One BL subscriber from Khulna VMSC calls a BL subscriber ofMGCT01. The call goes directly via MGCT01

But if a GP subscriber of Khulna calls a BL subscriber ofMGCT01, the call is routed 50-50 load share to both Tandem MSC

GP subscriber call BLA party=017xxxB party=019xxx

BL Subscriberdials 019XX

MGKL01

HLR

MGCT01

HLRinterrogation

RSN = BL_ROUTE

Route = MGCT01SRT = MGCT01

GGDH01

GGDH02

RSN = BL_ROUTERoute = PLMN

SRT=GGDH02

SRT=GGDH01

Analysis Table


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Basic Concepts

Thanks

ROuting Analysis

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