<----------- SABMR(1) <----------- Est Req(Ind=0)
<----------- SABMR(2)
<----------- SABMR(3)
.............
<----------- SABMR(N)
In each DLC either
UA is received or
NT1/NT2 is expired
Est Cfm -----------> (Status of DLCs
(Ind=0) are not updated)
<----------- Status Req
Status cfm ----------> (Mark DLC status
based on
status bits)
If one of more DLCs remains out-of-service after this procedure
(e.g., due to layer 2 management), the MGC can either retry this DLC
with an Est Req(Ind=1) indicating the specific DLC or with an
Est Req(Ind=0) and the SG will retry the appropriate DLC that is
out-of-service.
5.3. Information Transfer on a DLC
PBX SG MGC
<----------- UI(C) <----------- Data Req
UI(R)-----------> Data Ind ----------->
5.4. Link Takedown (Single DLC)
PBX SG MGC
(For DPNSS, mark DLC as OOS) <----------- Rel Req
(For DASSII, mark DLC as RA) (RELEASE_MGMT,
Ind=1)
Rel Cfm ---------->
(Ind=1)
5.5. Link Takedown (All DLCs)
PBX SG MGC
(For DPNSS, mark all DLCs as OOS) <-------- Rel Req
(For DASSII, mark DLC as RA) (RELEASE_MGMT,
Ind=0)
Rel Cfm ---------->
(Ind=0)
5.6. Getting Link Status
PBX SG MGC
<----------- Stat Req
Stat Cfm -----------> (Mark DLC status
based on
status bits)
5.7. Error Conditions
PBX SG MGC
Invalid Message <-----------Est/Rel/Data/-
Stat Req
Error Ind ----------->
(Error Code)
6. Security Considerations
The security considerations for the ISDN User Adaptation Protocol
(IUAP) [1] (Section 6) and the security considerations for SIGTRAN
Protocols document [4] apply to this document as well.
7. References
7.1. Normative References
[1] Morneault, K., Rengasami, S., Kalla, M., and G. Sidebottom,
"ISDN Q.921-User Adaptation Layer", RFC 3057, February 2001.
[2] Ofcom/NICC ND1301:2001/03, DPNSS [188], Digital Private
Signalling System No 1 (DPNSS 1) (Formerly BTNR 188).
[3] BTNR (British Telecom Network Requirements) 190 Issue 2 Digital
Access Signaling System No 2.
[4] Loughney, J., Tuexen, M., and J. Pastor-Balbas, "Security
Considerations for Signaling Transport (SIGTRAN) Protocols", RFC
3788, June 2004.
[5] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997.
8. Acknowledgements
The authors would like to thank Shashi Kumar and Venkatesh Seshasayee
of Wipro Technologies for their useful suggestions and comments.
Authors’ Addresses
All correspondence regarding this document should be sent to the
following addresses:
Ranjith Mukundan
Wipro Technologies
72, Electronics City
Hosur Main Road
Bangalore 560100
India
Phone: +91-80-51195893
EMail: ranjith.mukundan@wipro.com
Ken Morneault
Cisco Systems Inc.
13615 Dulles Technology Drive
Herndon, VA. 20171
USA
Phone: +1-703-484-3323
EMail: kmorneau@cisco.com
Narsimuloo Mangalpally
Nortel Networks
250 Sidney Street
Belleville, Ontario K8P 3Z3
Canada
Phone: +1-613-967-5034
EMail: narsim@nortelnetworks.com
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