Global VoIP Services Market Size, Share & Analysis By Call Type (International Voip Call, Domestic Voip Call), By Configuration (Computer-to-Computer, Computer to Phone, Phone to Phone), By Service (SIP Trunking, Hosted IP PBX, Managed IP PBX, Others), By End User (Individual User, Corporate User), Cost Optimization Trends, Competitive Benchmarking & Forecast 2025–2034