Skip to content

Design Principles and Governance

1. Overview

This document establishes the foundational design principles and governance standards that guide all architectural decisions throughout the Avaya to Webex Contact Center migration project. These principles ensure consistency, quality, and alignment with organizational objectives.

2. Core Design Principles

2.1 Scalability

Principle: Design systems to handle growth without architectural redesign.

Application: - Agent capacity: Design for 30% growth beyond current peak (1,300 agents) - Call volume: Architecture supports 2x current concurrent calls - Elastic cloud resources that auto-scale during peak periods - Modular design allowing incremental expansion

Success Criteria: - System handles 1,500 agents without performance degradation - Queue depth supports 500+ calls without overflow - Response time remains <2 seconds at 150% normal load

2.2 Resiliency and High Availability

Principle: Eliminate single points of failure; design for graceful degradation.

Application: - Redundant SBC/CUBE deployment (active-active or active-standby) - Multi-region Webex Contact Center deployment where available - PSTN failover routing to alternate carriers - Agent desktop failover to backup authentication paths

Success Criteria: - 99.9% uptime for contact center services - <30 second failover time for SBC/CUBE - Zero call loss during planned maintenance - Maximum 15-minute agent re-login during DR scenario

2.3 Security by Design

Principle: Security integrated at every layer, not retrofitted.

Application: - Zero Trust Network Access (ZTNA) principles - Encrypted communications: TLS 1.2+ for signaling, SRTP for media - Least privilege access model for all administrative functions - Multi-factor authentication (MFA) for all agent and admin logins - Regular security audits and penetration testing cycles

Success Criteria: - 100% of SIP traffic encrypted (TLS/SRTP) - Zero administrative accounts without MFA - Compliance with SOC 2, GDPR, PCI-DSS requirements - Quarterly security assessment completion

2.4 Least Privilege Access

Principle: Grant minimum permissions required for role function.

Application: - Role-Based Access Control (RBAC) for Webex Control Hub - Agent permissions limited to assigned queues/skills - Supervisor access restricted to team visibility - Administrative segregation: network, telephony, contact center admins - Service accounts with time-bound credentials

Success Criteria: - Zero shared administrative accounts - Documented permission matrix for all 15 defined roles - Quarterly access reviews and certification - Automated revocation upon role change (within 1 hour)

2.5 Hybrid-Ready Architecture

Principle: Support seamless operation across on-premises and cloud environments.

Application: - Cloud-first strategy with on-premises integration points - Abstraction layers for location-agnostic services - Consistent authentication (SSO) regardless of endpoint location - Unified monitoring across hybrid infrastructure

Success Criteria: - Agents can work from office, home, or cloud endpoint without workflow change - Single pane of glass for monitoring and management - <100ms latency between on-prem and cloud components

2.6 Observability and Operations

Principle: Comprehensive visibility into system health and performance.

Application: - Real-time dashboards for call flow, queue status, agent state - Proactive alerting for threshold breaches - Detailed logging for troubleshooting (SIP traces, application logs) - Integration with SIEM for security event correlation

Success Criteria: - <5 minute mean time to detect (MTTD) for critical issues - 100% of production components monitored - Automated alerting with <2 minute notification latency - Root cause analysis capability within 15 minutes

2.7 User Experience First

Principle: Optimize for agent productivity and customer satisfaction.

Application: - Simplified agent desktop with <3 clicks to answer call - Context preservation across channel transitions - Minimal training requirement (target: <4 hours for agent onboarding) - Consistent experience across desktop, mobile, and web clients

Success Criteria: - Agent satisfaction score >4.⅖.0 - <5 second average handle time increase post-migration - Zero calls dropped due to UI issues - 95% agent adoption within first week

3. Naming Conventions

3.1 Agent IDs

Format: WXC-<Location>-<Department>-<Number>

Examples: - WXC-NYC-SALES-0001 (New York sales agent #1) - WXC-LON-SUPPORT-0150 (London support agent #150)

Rules: - Location: 3-letter airport code - Department: Uppercase, max 10 characters - Number: 4-digit zero-padded sequential

3.2 Queue Identifiers

Format: Q-<BusinessUnit>-<Function>-<Priority>

Examples: - Q-RETAIL-BILLING-P1 (Retail billing priority 1) - Q-ENTERPRISE-SUPPORT-P2 (Enterprise support priority 2)

Rules: - BusinessUnit: Max 12 characters, uppercase - Function: Max 10 characters, descriptive - Priority: P1 (critical), P2 (standard), P3 (low)

3.3 Entry Point Numbers

Format: EP-<Country>-<Service>-<DID>

Examples: - EP-US-SALES-8005551234 (US toll-free sales line) - EP-UK-SUPPORT-4402071234567 (UK support DID)

Rules: - Country: ISO 3166-1 alpha-2 code - Service: Max 10 characters - DID: Full E.164 format number

3.4 IVR Flow Naming

Format: IVR-<Service>-<Version>

Examples: - IVR-CustomerService-v2.1 - IVR-TechnicalSupport-v1.5

Rules: - Service: CamelCase, descriptive - Version: Semantic versioning (major.minor)

3.5 Skill Definitions

Format: SKILL-<Category>-<Specialty>

Examples: - SKILL-LANG-Spanish (Spanish language skill) - SKILL-PROD-NetworkingSW (Networking software product skill) - SKILL-TECH-L3-Advanced (Level 3 advanced technical skill)

3.6 Team Naming

Format: TEAM-<Location>-<Function>

Examples: - TEAM-HYDERABAD-FinancialServices - TEAM-AUSTIN-TechSupport

4. Numbering and Identification Standards

4.1 Agent Capacity Planning

Location Current Agents Design Capacity Growth Buffer
Hyderabad 600 780 30%
Austin 300 390 30%
London 100 130 30%
Total 1,000 1,300 30%

4.2 Queue Sizing Standards

  • Small Queue: 1-20 agents, max 50 queued calls
  • Medium Queue: 21-100 agents, max 200 queued calls
  • Large Queue: 101+ agents, max 500 queued calls

4.3 Session Capacity (CUBE/SBC)

Formula: Total Sessions = (Peak Agents × 1.2) + (IVR Ports × 1.1) + 20% overhead

Example Calculation: 

Peak Agents: 1,000
Agent multiplier: 1,000 × 1.2 = 1,200 sessions
IVR Ports: 200 × 1.1 = 220 sessions
Overhead: (1,200 + 220) × 0.20 = 284 sessions
-----------------------------------------------------
Total Required Sessions: 1,704 sessions
Recommended CUBE License: 2,000 sessions

5. Documentation Standards

5.1 Document Structure

All technical documentation must include:

  1. Header Section:
  2. Document version
  3. Last updated date
  4. Owner/author
  5. Review cycle (quarterly/annual)

  6. Status (draft/active/archived)

  7. Overview: Purpose and scope in <200 words

  8. Body Content: Structured with clear headings (H2/H3 hierarchy)

  9. Diagrams: Where applicable, using Mermaid or Visio

  10. References: Links to related documentation

  11. Change Log: Version history at document end

5.2 Diagram Standards

  • Format: Mermaid (for text-based), Visio (for complex architecture)
  • Color Coding:
  • Blue: Webex cloud components
  • Green: On-premises infrastructure
  • Orange: Integration points

  • Red: Security boundaries

  • Labels: All components clearly labeled with identifiers

  • Legends: Required for all diagrams with >5 component types

5.3 Configuration Documentation

All configuration changes must be documented with:

  • What: Component and parameter changed
  • Why: Business/technical justification
  • When: Timestamp of change
  • Who: Change implementer
  • Rollback: Steps to reverse the change

Example: 

CHANGE-2025-001
Component: CUBE-Primary (10.50.1.10)
Parameter: dial-peer 100 session target updated
Old Value: 10.20.1.5:5060
New Value: wxcc-sbc.cisco.com:5061
Reason: Migration from Avaya CM to Webex Contact Center
Implementer: John Smith
Date: 2025-11-15 14:30 UTC
Rollback: dial-peer 100 / session target ipv4:10.20.1.5:5060

6. Change Management Governance

6.1 Change Categories

Category Approval Required Window Examples
Emergency On-call manager Immediate Service outage fix
Standard Change board Weekly Routine config updates
Major Executive sponsor Monthly Architecture changes

6.2 Testing Requirements by Change Type

Emergency Changes: - Peer review (if time permits) - Immediate post-change validation

Standard Changes: - Lab testing required - Test plan documentation - Rollback plan verified

Major Changes: - Full UAT cycle (2 weeks minimum) - Business stakeholder sign-off - Rollback rehearsal completed

6.3 Communication Standards

All changes require:

  1. Pre-notification: 72 hours minimum (except emergency)
  2. Status updates: Every 30 minutes during implementation
  3. Completion report: Within 4 hours of change completion

Communication Channels: - Email: contact-center-ops@company.com - Slack: #cc-migration-updates - ServiceNow: Change ticket with updates

7. Quality Gates

7.1 Design Phase Quality Gates

Before proceeding to implementation, verify:

  • All design principles addressed in architecture
  • Security review completed and approved
  • Capacity planning validated with 30% growth buffer
  • Naming conventions applied consistently
  • Documentation standards met
  • Stakeholder sign-off obtained

7.2 Implementation Quality Gates

Before production cutover:

  • All test cases passed (>98% success rate)
  • Security scan completed (zero critical vulnerabilities)
  • Performance testing validates <2s response time
  • Disaster recovery tested successfully
  • Runbook documentation complete
  • Training completed for operations team

7.3 Post-Migration Quality Gates

Within first 30 days:

  • Service level agreements met (>95% target)
  • Zero P1 incidents related to migration
  • Agent satisfaction survey completed (>4.0/5.0)
  • Customer satisfaction maintained or improved
  • Documentation updated with as-built details

8. Compliance and Audit Requirements

8.1 Regulatory Compliance

Design must maintain compliance with:

  • PCI-DSS: Payment card data handling
  • GDPR: EU customer data protection
  • SOC 2 Type II: Service organization controls
  • HIPAA: Healthcare data (if applicable)
  • State privacy laws: CCPA, CPRA (California)

8.2 Audit Trail Requirements

All systems must maintain:

  • Authentication logs: 90-day retention minimum
  • Configuration changes: 7-year retention
  • Call detail records (CDR): Per regulatory requirement
  • Security events: 1-year retention minimum

8.3 Data Residency

  • Default: US data centers for US customers
  • EU customers: EU region deployment required (GDPR)
  • Cross-border: Explicit customer consent required

9. Continuous Improvement Framework

9.1 Review Cycles

  • Weekly: Operational metrics review
  • Monthly: Performance trend analysis
  • Quarterly: Design principle reassessment
  • Annual: Full architecture review

9.2 Feedback Loops

  • Agent feedback surveys (monthly)
  • Customer satisfaction tracking (real-time)
  • Incident retrospectives (within 48 hours of resolution)
  • Stakeholder business reviews (quarterly)

9.3 Innovation Pipeline

  • Evaluate new Webex Contact Center features quarterly
  • Pilot programs for AI/automation opportunities
  • Industry best practice benchmarking (annual)

10. Roles and Responsibilities

10.1 Architecture Governance

Role Responsibility Authority
Chief Architect Final design decisions Approve/reject major changes
Security Architect Security principle compliance Veto on security grounds
Network Architect Connectivity design SBC/CUBE architecture approval
Contact Center Architect Routing/IVR logic Queue/flow design approval

10.2 Decision Escalation Path

  1. Level 1: Technical team consensus
  2. Level 2: Architecture review board
  3. Level 3: Program steering committee
  4. Level 4: Executive sponsor

11. Success Metrics

11.1 Technical Metrics

  • Availability: 99.9% uptime target
  • Performance: <2 second call setup time
  • Scalability: Support 30% growth without redesign
  • Security: Zero critical vulnerabilities

11.2 Business Metrics

  • Agent productivity: <5% handle time increase
  • Customer satisfaction: Maintain or improve CSAT
  • Cost efficiency: 20% reduction in telecom costs (3-year TCO)
  • Time to market: New queue deployment <2 hours

12. References

  • Cisco Webex Contact Center Design Guide: [Link to Cisco documentation]
  • Enterprise Security Policy: [Link to internal security standards]
  • Change Management Procedures: [Link to ITSM documentation]
  • Compliance Framework: [Link to regulatory requirements]

Appendix A: Design Decision Template

Use this template for documenting major architectural decisions:

## Design Decision: [Title]

**Decision ID:** DD-YYYY-NNN
**Date:** YYYY-MM-DD
### Context
[Describe the problem or opportunity]

### Options Considered
1. Option A: [Description]
   - Pros: [List]
   - Cons: [List]

2. Option B: [Description]
   - Pros: [List]
   - Cons: [List]

### Decision
[Selected option and rationale]

### Consequences
[Impacts and implications]

### Compliance
Design Principles Addressed:
- [ ] Scalability
- [ ] Resiliency
- [ ] Security by Design
- [ ] Least Privilege
- [ ] Hybrid-Ready

End of Document