Carrier-grade SIP trunks for your existing PBX — migrate without changing hardware.

What is SIP Trunking

A SIP Trunk connects your existing phone system (PBX) to the public telephone network over the internet, replacing traditional analog or ISDN lines. Nothing changes in your equipment — only the way calls reach it.

With a SIP Trunk you can consolidate dozens of lines into a single IP channel, scale instantly when needed, and dramatically reduce monthly fees.

Why Smart-VoIP SIP Trunks

Our SIP trunks don’t go through third-party VoIP brokers. They connect directly to our softswitch servers in our Greek Data Center, with peering at GR-IX and direct interconnections with tier-1 operators (AS212485). Short, stable paths for every call, with 99.99% service uptime.

Compatibility with your existing PBX

We work with all major phone systems:

• Yeastar (S-Series, P-Series, Cloud PBX)
• 3CX (V18, V20, V21)
• Panasonic (NS500, NS700, NS1000, KX-NSX)
• Cisco Unified Communications Manager
• Asterisk / FreePBX / Issabel
• Avaya IP Office
• Mitel / NEC

Setup is done with credentials (host, username, password) we provide — no PBX hardware change.

Key benefits

• Reduce monthly fees up to 70%. Eliminate multiple analog/ISDN lines and the corresponding fixed-line carrier charges.
• Pay only for the channels you use. No overcharging for idle lines. Auto-scaling during peak hours.
• Unlimited capacity when you need it. Burst to hundreds of concurrent calls without hardware upgrades or new lines.
• Carrier-grade voice quality. MOS score 4.3+. Direct routing through tier-1 carriers.
• One bill for all lines. No more juggling multiple providers and invoices.

How the migration works

1. Audit. We document your current lines, average and peak usage, your PBX requirements.
2. Proposal. We propose a SIP trunk configuration with specific channel count and pricing. Average partner sees a 50–70% bill reduction.
3. Configuration. We send you credentials. If you need help with PBX configuration, we handle remote setup at no extra charge.
4. Number portability. We port your existing numbers from your current provider with no downtime for your customers (5–10 business days).
5. Monitoring. 24/7 NOC monitoring from our Greek-based technical team.

Technical specs

• Protocol: SIP over UDP, TCP or TLS
• Codecs: G.711 A-law, G.729, OPUS
• DTMF: RFC 4733 (out-of-band)
• Multiple IP interconnections with failover routing
• Authentication: IP-based or username/password
• CDR & call statistics via portal
• SBC protection against fraud & DoS attempts

Related services

• Cloud PBX — If you don’t have your own phone system, we provide a complete virtual PBX.
• DID Numbering — New geographic numbers from across Greece.
• Wholesale Voice — For providers, resellers and call centers with high termination volume.

Ready to cut your costs?

Send us your current fixed-line bill or your PBX specs — we’ll get back with a clear SIP trunk quote within 24 hours.