Case Study
How a Thai trading company replaced an aging Panasonic PABX with Yeastar Cloud PBX, retained all DID numbers, and enabled a hybrid sales team — in 10 business days.
Thai trading company headquartered in Bangkok with 95 users across sales, operations, and management departments. The company operates a hybrid sales team with staff frequently working from client sites, home offices, and the main office.
The existing Panasonic PABX system had reached end-of-life and the support contract could not be renewed. Remote sales staff had no extension mobility — they relied on personal mobile numbers, making it impossible to track missed calls or transfer customers to the right department.
PRI trunk costs were high relative to call volume, and adding new extensions required on-site technician visits. The company needed a modern system that could scale without hardware constraints.
SIPPER deployed a Yeastar P570 Cloud PBX on its Pure VoIP Network with SIP Trunk, retaining all existing DID numbers for business continuity. Standard desk phones (Yealink T31G) were provisioned for general staff, while reception and supervisors received Yealink T54W with color displays and BLF keys.
A FortiGate firewall was configured with QoS policies to prioritize voice traffic over the office WAN link. Remote and hybrid staff were set up with the Linkus mobile app, giving them full extension functionality from any location.
The full deployment was completed in 10 business days. A 3-day pilot phase ran in parallel with the legacy system, allowing key users to validate call quality and workflow. The final cutover was performed after business hours to minimize disruption.
Number porting from the PRI provider to SIP Trunk was coordinated in advance, ensuring zero downtime on inbound numbers during the transition.
Monthly voice costs decreased by 25–35% after migrating from PRI to SIP Trunk. The cutover itself resulted in less than 2 hours of downtime. Remote staff gained full extension access via the Linkus mobile app, and supervisors gained missed-call visibility across all departments.
The company can now add or reassign extensions in minutes through the web-based admin panel, without requiring an on-site technician.
Yeastar P570 Cloud PBX, SIPPER SIP Trunk with DID retention, Yealink T31G (standard desks), Yealink T54W (reception and supervisors), FortiGate firewall with QoS, Linkus UC mobile app.
This case study represents a typical deployment scenario based on real project patterns.
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