1. BT Wholesale Overflow and High Usage Options Current position - OverflowCurrent position - Overflow Principle for Route Dimensioning is that all Traffic Routes be fully provided.Principle for Route Dimensioning is that all Traffic Routes be fully provided. Overflow allowed between fully provided Traffic Routes i.e where an Operator has more than one Traffic Route to a BT Switch then they can request calls to overflow between them.Overflow allowed between fully provided Traffic Routes i.e where an Operator has more than one Traffic Route to a BT Switch then they can request calls to overflow between them. No restrictions on how “own” traffic is carried in owning party’s network.No restrictions on how “own” traffic is carried in owning party’s network.

2. BT Wholesale Overflow and High Usage Options Current position - Overflow post NTS Links Reversal.Current position - Overflow post NTS Links Reversal. Fully Provided requirement (Annex A par. 5.4.2) applies to this traffic type.Fully Provided requirement (Annex A par. 5.4.2) applies to this traffic type. Therefore, Overflow from Switch Connections for BT- Operator NTS is limited to Operator Traffic Routes from that Switch Connection only (but see DLEs).Therefore, Overflow from Switch Connections for BT- Operator NTS is limited to Operator Traffic Routes from that Switch Connection only (but see DLEs).

3. BT Wholesale Overflow and High Usage Options Current position - Manual Operational Intervention.Current position - Manual Operational Intervention. In the case of operational difficulties, Operations departments may agree expedient re-routing for a limited time using any available capacity.In the case of operational difficulties, Operations departments may agree expedient re-routing for a limited time using any available capacity. Increase the likelihood of successful CallsIncrease the likelihood of successful Calls Only where this does not affect the GOS of other services.Only where this does not affect the GOS of other services.

4. BT Wholesale Overflow and High Usage Options Proposed Changes - Overflow from DLEsProposed Changes - Overflow from DLEs Recognising the growth in DLE connection BT has been looking at the possibility of making overflow available via the tandem layer where Calls temporarily exceed available Capacity.Recognising the growth in DLE connection BT has been looking at the possibility of making overflow available via the tandem layer where Calls temporarily exceed available Capacity. Principle of Fully Provided Routes still applies therefore this would only be used as a temporary measure pending Route Augmentation.Principle of Fully Provided Routes still applies therefore this would only be used as a temporary measure pending Route Augmentation. Reflecting changes in types of Calls we have looked at the following scenarios :-Reflecting changes in types of Calls we have looked at the following scenarios :-

5. BT Wholesale Overflow and High Usage Options Proposed Changes - Overflow from DLEsProposed Changes - Overflow from DLEs Voice - overflow will be made available for voice services number ranges in accordance with agreed routing plan if requested.Voice - overflow will be made available for voice services number ranges in accordance with agreed routing plan if requested. Data - no overflow can be made available for these number ranges due to factors such as aggressive redial characteristics. This covers calls to the internet including VOIP.Data - no overflow can be made available for these number ranges due to factors such as aggressive redial characteristics. This covers calls to the internet including VOIP. Mixed number ranges - where a voice number range is contaminated by data services then no overflow facility will be available.Mixed number ranges - where a voice number range is contaminated by data services then no overflow facility will be available. Contract text will be amended to allow this.Contract text will be amended to allow this.

6. BT Wholesale Overflow and High Usage Options High Usage Rules -High Usage Rules - Available for traffic to BT DLEs from an Operators Network or to Operator Local exchanges from the BT Network only. - Annex A par. 5.3.3Available for traffic to BT DLEs from an Operators Network or to Operator Local exchanges from the BT Network only. - Annex A par. 5.3.3 Limited HU option that was made available for Surftime type services no longer available.Limited HU option that was made available for Surftime type services no longer available.

7. BT Wholesale Overflow and High Usage Options Any Questions ?Any Questions ?