1. 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

2. 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

3. 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.

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

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

6. 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
Registered: RJ
CFNRC: VMS
PRN’
Sub X
Ericsson
Proprietary
RCH Ack.’
RCH’
MSC/VLR
No Page
Response,
Busy or
No Answer
Long
distance
carrier
Paging
Coverage Area
GMSC
POTS
VMS
Office:

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

8. 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.

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

10. 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)