This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Sr. Support Specialist, Phones based in Mexico. This is a specialized technical support role focused on resolving complex VoIP, SIP, and PBX challenges for multi-site clients.You will troubleshoot issues across call flows, network connectivity, call quality, and telephony infrastructure.The role combines hands-on technical investigation with direct client communication and remote diagnostics.You will manage a high volume of support tickets while maintaining service-level commitments and clear documentation.Your expertise will help reduce escalations, improve first-contact resolution, and strengthen the overall support operation.You will also contribute to a growing knowledge base by documenting recurring problems and effective solutions.The position is fully remote and requires strong English communication and availability aligned with North American business hours.