FutureComm 2010: Scaling Advanced VoIP Telecom Services
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This document discusses scaling challenges for advanced VoIP telecom services and SIP delivery solutions. It outlines how traditional TDM architectures used static provisioning that was inefficient and not agile. IP architectures allow for dynamic load balancing of servers in a clustered pool for linear scaling. Load balancing concepts like weighted round robin, transaction-based switching, and persistence by call-ID or user ensure optimal server selection and guarantee transaction handling by the same server. Advanced features like transport conversion, call admission control, header manipulation, and geographic load balancing further improve scalability and disaster recovery. The document recommends adapting architectures to these advanced IP delivery models for benefits like linear scaling, protecting investments, simplifying applications, and reducing time-to-market.
FutureComm 2010: Scaling Advanced VoIP Telecom Services
- 1. Scaling Advanced VoIP Telecom Services Amir Peles Chief Technology Officer October 2010
- 2. Slide 2 Agenda VoIP Deployment Scaling Challenges SIP Delivery Solutions Summary
- 3. Slide 3 Agenda VoIP Deployment Scaling Challenges SIP Delivery Solutions Summary
- 4. SIP Architecture - IMS Lite / IMS Architecture Session Border Controllers VoIP Gateways Soft Switches IMS x-CSCF SIP App. Servers Call Centers
- 5. VOIP Access / Service Enablement – The ADC Need • The peering, trunking, and consumer access points are governed by SBC-s, P/I-CSCF-s, Soft Switches and media gateways, all of which have limited scaling – New calls per second < 100 – Concurrent sessions < 10,000 • Main Scaling Challenges – Application state synchronization for billing and policing – Failures and performance bottlenecks – Provisioning OPEX and ineffective over subscription Slide 5
- 6. Deployment Scenarios – Application/Service Tier • SIP applications include – Traditional VoIP – Conferencing / Video Conferencing – Voicemail / IVR – Presence – Messaging – Call Centers – Interactive E-learning – And many more… • Additional Scaling Challenges: – Concurrent streaming sessions – Bandwidth and processing requirements for new Codecs and Video standards – Sophisticated application logic and call flows Slide 6 Interactive Gaming Collaboration–Virtual Whiteboarding Video C onferencing Instant M essaging Presence Distance Learning MixedMedia Communications Personal Mobility VoIP SIP IP Convergence
- 7. Application / Service Tier – The ADC Need The overall scale challenge: • Scale-as-you-Grow • protecting previous investment and guaranteeing service quality Slide 7
- 8. Slide 8 Agenda VoIP Deployment Scaling Challenges SIP Delivery Solutions Summary
- 9. TDM-like scaling • “TDM over IP” Architecture – Scaling in the traditional TDM architecture was normally achieved by statically configuring sets of clients to a specific server – Complex Static Provisioning – Inefficient Over-Subscription models • Inefficient and not agile Slide 9
- 10. IP Scaling Advantages vs. TDM • IP Architecture – Dynamic Load Balancing – The same utilization advantages afforded by the flexibility of IP packets switching (vs., circuit switching) can be incorporated into the scaling model – Servers are all configured identically and clustered into a pool, abstracted as a service available to all clients • New servers are added dynamically on-demand • Scaling is linear and isolated from the provisioning process – Servers may have different capabilities • Server selection identifies the required service for each transaction for optimal server selection • Huge cost saving – up to 50% over the TDM-like model Slide 10
- 11. Load Balancing Concepts – Cluster Management • Load Distribution – New client sessions or messages are distributed by the ADC amongst cluster service through a selection of distribution algorithm: • Weighted round robin – Short transactions (messaging / presence / DNS) • Least number of users / calls – Video transactions • Lowest CPU utilization – Complex application transaction • Transaction based switching – The ADC inspects the message content to apply the distribution across multiple server pools according to: • Codec type • Device User-Agent • Content URI Slide 11 SIP Server Farms SIP: INVITESIP: INVITE
- 12. Load Balancing Concepts – Cluster Distribution • Persistent transactions – Some applications require that the same server will handle multiple sessions that form a transaction • Multiple callers for a Video conferencing service • User’s registration and incoming/outgoing transactions • User’s portal access and media transactions – Persistency Types include • Call-ID • Call-ID + Conference-ID • User ID • Source IP • Any L7 Parameter Slide 12 Call-ID = 1223023@a.com Server 1 Invite SIP: bob@b.com From : alice@a.com To: bob@b.com Call-ID: 1223023@a.com SIP Proxies
- 13. Load Balancing Concepts – Cluster Distribution • Persistent transactions – Some applications require that the same server will handle multiple sessions that form a transaction • Multiple callers for a Video conferencing service • User’s registration and incoming/outgoing transactions • User’s portal access and media transactions – Persistency Types include • Call-ID • Call-ID + Conference-ID • User ID • Source IP • Any L7 Parameter Slide 13 Call-ID = 1223023@a.com Server 1 BYE From : alice@a.com To: bob@b.com Call-ID: 1223023@a.com SIP Proxies
- 14. Advanced Scaling Features • Transport Conversion – TCP TLS UDP / IPv4 IPv6 • Call Admission Control – Centralized CAC – Burst handling and Priority call guarantee • Header Manipulation – Normalizing message format – SIP and SDP headers • Geographic Load Balancing – Disaster Recovery – uninterrupted Failover and Failback – Scaling to a Multi-Site service Slide 14
- 15. Slide 15 Agenda VoIP Deployment Scaling Challenges SIP Delivery Solutions Summary
- 16. Summary Adapt your architecture to advanced IP delivery models • Achieve Linear Scale in your cost model • Protect your investment • Simplify application logic • Reduce your time-to-market Slide 16
- 17. Thank You !