SIP trunking for UK businesses

A SIP trunk is a wholesale connection that points your own PBX (3CX, Asterisk, Mitel) at the public phone network over the internet — you keep your PBX, we supply the dial-tone and UK numbers.

For businesses keeping an on-prem PBX through the 2027 switch-off. Quote-based; ask sales for channel pricing.

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What Silux Call’s sip trunking includes

UK number ranges + porting
Per-channel or per-minute billing
Works with 3CX / Asterisk / FreePBX / Mitel
Fraud monitoring + spend caps
4G failover routing

Also known as

UK buyers search for sip trunking under many names. Silux Call covers all of them: sip trunk uk, sip trunking provider, sip channels, voip trunk, sip trunk for 3cx.

FAQs — SIP trunking

What is sip trunking?

A SIP trunk is a wholesale connection that points your own PBX (3CX, Asterisk, Mitel) at the public phone network over the internet — you keep your PBX, we supply the dial-tone and UK numbers.

How much does sip trunking cost in the UK?

For businesses keeping an on-prem PBX through the 2027 switch-off. Quote-based; ask sales for channel pricing.

What can Silux Call's sip trunking do?

UK number ranges + porting; Per-channel or per-minute billing; Works with 3CX / Asterisk / FreePBX / Mitel; Fraud monitoring + spend caps; 4G failover routing.

Is SIP trunking ready for the 2027 PSTN switch-off?

Yes. Silux Call runs entirely over IP, so sip trunking is unaffected by the 31 January 2027 PSTN switch-off — every account also gets a free WLR2 migration audit.

SIP trunking by industry

SIP trunking by UK city

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