Called Party in Roaming Roaming Principles Charging Called Party in Roaming HLR HLR SCP (iii) PRN, resp (MSRN) (ii) PRN (i) SRI (iv) SRI, resp (MSRN) CAU-B GMSC MSC/VLR 0 CSP MSRN* MSC/ VLR LDO A B is in roaming B MSRN*=Mobile Station Roaming Number no formato nacional Calling Party Pays Called Party Pays

Called Party with Call Forwarding Service Roaming Principles Charging with Call Forwarding Called Party with Call Forwarding Service HLR HLR SCP (iii) PRN, resp (MSRN) (ii) PRN (i) SRI (iv) SRI, resp (MSRN) CAU-B GMSC MSC/VLR 0 CSP MSRN* MSC/ VLR LDO A B is in roaming B 0 CSP CAU-C CFNRc / CFNRy 0 CSP CAU-C CFU Called Party Pays Called Party Pays Calling Party Pays Called Party Pays

Charging of Call Forwarding ANATEL 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.

Call Forwarding, National Roaming - 1 of 3 Terminated call reaches the GMSC, CFU active Campinas (019) Rio do Janeiro (021) HLR Sub X 019 9165 4321 Registered: RJ CFU: 019 3233 3333 (ii) SRI, resp (CFU) (i) SRI MSC/VLR 019 9165 4321 Long distance carrier Coverage Area GMSC POTS VMS Office: 019 3233 3333 Signaling Traffic

Call Forwarding, National Roaming - 2 of 3 Standard way and “trombone”effect, CFNRC active Campinas (019) Rio do Janeiro (021) HLR Sub X 019 9165 4321 Registered: RJ CFNRC: 019 3233 3333 (iii) PRN, resp (MSRN) (ii) PRN Sub X 019 9165 4321 CFNRC: 019 3233 3333 (iv) SRI, resp (MSRN) (i) SRI MSC/VLR 019 9165 4321 No Page Response Paging Long distance carrier Coverage Area GMSC POTS VMS Office: 019 3233 3333 Signaling Traffic

Call Forwarding, National Roaming - 3 of 3 Optimal Routing on Late Call Forwarding (OR on LCF) Campinas (019) Rio do Janeiro (021) HLR Signaling Traffic Sub X 019 9165 4321 Registered: RJ CFNRC: VMS PRN’ Sub X 019 9165 4321 Ericsson Proprietary RCH Ack.’ RCH’ MSC/VLR 019 9165 4321 No Page Response, Busy or No Answer Long distance carrier Paging Coverage Area GMSC POTS VMS Office: 019 3233 3333

International Roaming Terminated call successful Brazil (55) Mexico (52) HLR Sub X 021 9165 4321 Registered: Mexico (ii) PRN (iii) PRN, resp (MSRN) (i) SRI (iv) SRI, resp (MSRN) MSC/VLR 021 9165 4321 International Long distance carrier GMSC Signaling Traffic

Roaming and Call Forwarding Concerns – 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 – GSM Charging ?! Roaming and Call Forwarding Concerns – 2 of 3 National Roaming – GSM Charging ?! OPERATOR X OPERATOR Y Overlapping Coverage

Use (Mobile Originating) Roaming and Call Forwarding Concerns – 3 of 3 OSB – Operator Specific Barring Blocking outside HLR 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 Category Use (Mobile Originating) OSB1 Blocking of Long Distance Calls OSB2 - OSB3 OSB4 (VPN ATS, by Claro)