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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