AVAYA SA ESS C/D B5800 BG R6 SIP SES

Protect SIP SES voice infrastructure built on Avaya SA ESS C/D B5800 BG R6 with a three-year support and maintenance engagement (MPN 257110J). This service is designed for infrastructure leaders who require documented vendor paths for incident response, maintenance windows, and compatibility guidance for SIP-enabled deployments. The plan groups vendor contact, problem escalation, and maintenance coordination into a single service identifier to reduce administrative overhead and speed resolution. For procurement, it simplifies cost forecasting; for architects, it secures an accountable vendor relationship for components and interoperability that touch SIP session management. Delivery specifics, including response times and any on-site tasks, are detailed in the service order. Use this plan where SIP session stability and vendor traceability are primary procurement criteria.