New SIPPING Draft available
Ok - not so new, but available :)
A solution for the HERFP caused by forked SIP INVITE requests
Publisher: Jeroen van Bemmel
This document describes a solution to the Heterogeneous Error Response Forking Problem (HERFP), a situation in which a UAC remains unaware of elements that are responding to its INVITE with a 'repairable' error response, because a forking proxy in the signalling path only forwards what it considers the 'best' final response. This issue may cause communication establishment to be delayed or even fail. To address this issue this document proposes a new method [preliminarily called 'FIX'] to be used by a forking proxy that detects a HERFP to notify the UAC of a repairable error.
J.van Bemmel worked for a research project "4G+" with very interesting conclusions and a Demonstrator:
"The result is an integrated demonstrator including all the components we have developed and tested during the project. We have validated that seamless roaming requires that users have access to networks with authentication under the hood (no user interaction required). We have built enhanced components to support detection of networks and interfaces, the decision process on the best possible network to use and selection of network and interface. We have tested mobility with Mobile IP, SIP and proprietary application layer protocol to support session mobility. While individual mobility protocols solve many but not all problems, combining Mobile IP and SIP creates a new range of issues that need further research. We created a solution to supply the mobility manager on the mobile terminal with knowledge of the network (in a secure fashion): authentication method, network cost, network characteristics, value added services etc."
Read and learn ...
A solution for the HERFP caused by forked SIP INVITE requests
Publisher: Jeroen van Bemmel
This document describes a solution to the Heterogeneous Error Response Forking Problem (HERFP), a situation in which a UAC remains unaware of elements that are responding to its INVITE with a 'repairable' error response, because a forking proxy in the signalling path only forwards what it considers the 'best' final response. This issue may cause communication establishment to be delayed or even fail. To address this issue this document proposes a new method [preliminarily called 'FIX'] to be used by a forking proxy that detects a HERFP to notify the UAC of a repairable error.
J.van Bemmel worked for a research project "4G+" with very interesting conclusions and a Demonstrator:
"The result is an integrated demonstrator including all the components we have developed and tested during the project. We have validated that seamless roaming requires that users have access to networks with authentication under the hood (no user interaction required). We have built enhanced components to support detection of networks and interfaces, the decision process on the best possible network to use and selection of network and interface. We have tested mobility with Mobile IP, SIP and proprietary application layer protocol to support session mobility. While individual mobility protocols solve many but not all problems, combining Mobile IP and SIP creates a new range of issues that need further research. We created a solution to supply the mobility manager on the mobile terminal with knowledge of the network (in a secure fashion): authentication method, network cost, network characteristics, value added services etc."
Read and learn ...
Peter0101 - 8. Sep, 11:12
