Open Forum 2015 11th November 2015.

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Presentation transcript:

Open Forum 2015 11th November 2015

SIP Overload Control (SOC) Task Group Philip Williams – BT Chair of Group

Drivers SIP increasing Wider application Protocol efficiency connectivity applications traffic Wider application not just session control Protocol efficiency verbose? Generic overload control principles still apply 

Overload control imperative Excessive nodal load  high response times  timeouts + caller abandons + retries  ineffective workload  ‘goodput’ crash Nodal Excessive destination focused load  high busy rate  ineffective workload ‘goodput’ reduction Destination

SOC TG Strategy Basis – 3 IETF SOC RFCs Requirements Options Guidance need for external restriction of load demonstrated prior experience Requirements clarify: purpose, scope of application integration with other functions / signalling protocols overcome any RFC design issues or gaps traffic priorities Options identify what should be optional and what shouldn’t Guidance implementation - fill in the gaps highlight re-use opportunities Recommendations the detail

Progress – RFCs Well understood choices highlighted some issues identified Title RFC Purpose Method SIP Overload Control 7339 Nodal overload control Hop-by-hop (Via Header) SIP Rate Control 7415 " SIP Load Control Event Package 7200 Destination overload control Subscribe-Notify

Progress - Requirements Source (Client) SIP message restriction algorithms Max Rate – ‘rate-based’ or Proportional rejection – ‘loss-based’ Interaction with load-balancing & failover Load-share → Restrict (SOC) Restrict (SOC) → Load-share ? Differentiated workload - message/session priorities Target Server, Source Client: Which messages should they count? Mixed protocol architecture, e.g. ISUP, BICC ISUP AACC  SOC hop-by-hop Non-conforming traffic sources Can they be detected? What action should be taken?

To be continued … Would you like to be involved?