Called Party in Roaming

B is in roaming

GMSCMSC/VLR

LDO

B

MSC/VLR

HLR SCP

Calling Party Pays Called Party Pays

MSRN*=Mobile Station Roaming Number no formato nacional

A

HLR

CAU-B 0 CSP MSRN*

Roaming PrinciplesCharging

(i) SRI (ii) PRN

(iii) PRN, resp

(MSRN)

(iv) SRI, resp

(MSRN)

Called Party with Call Forwarding Service

B is in roaming

GMSCMSC/VLR

LDO

B

MSC/VLR

HLR SCP

Calling Party Pays Called Party Pays

A

HLR

CAU-B 0 CSP MSRN*

0 CSP CAU-CCFU Called Party Pays

0 CSP CAU-CCFNRc / CFNRy

Called Party Pays

Roaming PrinciplesCharging with Call Forwarding

(i) SRI

(ii) PRN(iii) PRN, resp

(MSRN)

(iv) SRI, resp

(MSRN)

Charging of Call ForwardingANATEL Regulation 245, art. 77°

A chamada dirigida a Usuário Visitante será tratada como composta por duas chamadas para efeito de faturamento.

§ 3º Aplica-se ao disposto neste artigo às chamadas reencaminhadas para outro Código de Acesso a pedido do Usuário, sendo que nesta hipótese a segunda chamada tem origem na Área de Registro do Usuário e destino no Código de Acesso para o qual foi reencaminhada a chamada.

• GSM Postpaid

– Optimal Routing at Late Call Forwarding optional feature

• TDMA Postpaid

– Already Supported

• PrePaid (GSM and TDMA)

– The collect call restrictions for terminating calls in SMP prepaid subscribers are also applied.

GMSC

MSC/VLR

Long distance

carrier

HLR

Coverage Area

Campinas (019) Rio do Janeiro (021)

Sub X 019 9165 4321 Registered: RJ CFU: 019 3233 3333

VMS

019 9165 4321

POTS

Office: 019 3233 3333 SignalingTraffic

Call Forwarding, National Roaming - 1 of 3Terminated call reaches the GMSC, CFU active

(i) SRI

(ii) SRI, resp

(CFU)

GMSC

Long distance

carrier

HLR

Coverage Area

Sub X 019 9165 4321 Registered: RJ CFNRC: 019 3233 3333

VMSPOTS

Office: 019 3233 3333

PagingNo PageResponse

Sub X 019 9165 4321 CFNRC: 019 3233 3333

Campinas (019) Rio do Janeiro (021)

019 9165 4321

SignalingTraffic

Call Forwarding, National Roaming - 2 of 3Standard way and “trombone”effect, CFNRC active

(i) SRI

(ii) PRN(iii) PRN, resp

(MSRN)

(iv) SRI, resp

(MSRN)

MSC/VLR

GMSC

Long distance

carrier

HLR

Coverage Area

Sub X 019 9165 4321 Registered: RJ CFNRC: VMS

VMS

019 9165 4321

POTS

Office: 019 3233 3333

PagingNo Page Response,Busy or No Answer

Sub X 019 9165 4321

Campinas (019) Rio do Janeiro (021)

PRN’

EricssonProprietary

RCH’

RCH Ack.’

Call Forwarding, National Roaming - 3 of 3Optimal Routing on Late Call Forwarding (OR on LCF)

SignalingTraffic

MSC/VLR

GMSC

MSC/VLR

InternationalLong

distance carrier

HLRBrazil (55) Mexico (52)

Sub X 021 9165 4321 Registered: Mexico

021 9165 4321

SignalingTraffic

International RoamingTerminated call successful

(i) SRI

(ii) PRN

(iii) PRN, resp

(MSRN)(iv) SRI, resp

(MSRN)

Roaming and Call ForwardingConcerns – 1 of 3

• OR on LCF depends on Ericsson nodes at both sides

• Thus not applicable when different Core vendors are involved:

National Roaming (i.e. TA – Oi)

International Roaming

• ANATEL Regulation 316, art. 29 and paragraph 6o mentions explicitly that Voice Mail access shall not be considered as Call Forwarding. Possible solutions:

TA pays the Long Distance International leg of the call to VMS (absolutely not suggested)

Ericsson optional feature that blocks Call Forwarding services of the users roaming internationally.

National Roaming – GSMCharging ?!

OPERATOR X OPERATOR Y

OverlappingCoverage

Roaming and Call ForwardingConcerns – 2 of 3

OSB – Operator Specific BarringBlocking outside HLR

Category Use (Mobile Originating)

OSB1 Blocking of Long Distance Calls

OSB2 -

OSB3 -

OSB4 (VPN ATS, by Claro)

• In the GSM standard OSB is not sent outside HPLMN • In Brazil TIM and Oi sends OSB also to each others and

therefore also to TA!• Be aware of roaming subscribers and the use of OSB

Roaming and Call ForwardingConcerns – 3 of 3