GHL LC Phone vs. BYO SIP Trunk: A Cost and Control Comparison

What LC Phone Is and Is Not

LC Phone is GoHighLevel's built-in telephony layer. It abstracts Twilio's API behind GHL's dashboard — number provisioning, outbound dialing, inbound routing, and SMS all work from a single panel without any external carrier account.

That simplicity is the product. The tradeoff is pricing structure: you pay a per-minute rate on every outbound call, plus a per-SMS rate, plus a monthly DID fee. The rates are reasonable for low-volume use. They become expensive at scale, and they are not negotiable. There is no volume discount tier, no flat-rate option, and no path to bring your own carrier economics inside the LC Phone wrapper.

For an agency managing 30 sub-accounts each running 5 outbound agents, LC Phone per-minute costs are not a line item — they are a business model constraint.

What BYO SIP Gives You

GoHighLevel's BYOC setting routes calls through an external SIP endpoint rather than Twilio's termination layer. The GHL dialer UI, softphone, and CRM timeline all continue to function — agents see the same interface, call logs still post to contacts, and workflows still trigger on call events. The only thing that changes is which carrier terminates the call.

That switch has three practical consequences:

Cost structure. An external flat-rate trunk like UnlimCall charges per seat, not per minute. At $99/seat/month (US and Canadian markets), a seat carries unlimited outbound minutes. The daily rate is $4.95 per active seat, which is $99 ÷ 20 working days. A team of 10 agents pays $990/month flat regardless of how many hours each agent spends on the phone.

Carrier routing. With BYO SIP, you choose which provider terminates your traffic. Route quality, answer rates, and failover behavior depend on your trunk provider's network — not Twilio's default routing for your traffic type.

Attestation control. STIR/SHAKEN attestation for US and Canadian outbound calls is applied by the trunk provider, not by GHL. When you own the DID and the trunk applies an A-attestation signature, calls land as "Verified Caller" on compatible handsets. This is not available through LC Phone's default configuration.

Head-to-Head: Where Each Option Wins

LC Phone is the right choice when: you are building a sub-account for a client who makes fewer than 60–90 minutes of outbound calls per agent per day, the client needs SMS heavily, and simplicity of a single vendor matters more than per-minute cost.

BYO SIP is the right choice when: agents are running structured outbound shifts, talk time per agent exceeds 2 hours per day, you are managing multiple sub-accounts and want a single trunk bill rather than per-account Twilio charges, or STIR/SHAKEN attestation is important to call answer rates.

A 5-agent team with average talk time of 3 hours per agent per day generates 15 hours or 900 minutes per day. At a common LC Phone outbound rate, that produces a material monthly cost. The same team on a flat-rate trunk at $495/month pays the same bill whether those agents work 900 minutes or 1,500.

Caller ID in Both Models

LC Phone provisions numbers from Twilio's pool. Numbers are shared across GHL's customer base until purchased and dedicated. The pool is not small, but you are selecting from existing inventory.

UnlimCall provisions caller IDs on demand across 33 live markets. There is no pool — you request the number for the country you are dialing into, and it is provisioned to your account. Agencies running outbound into multiple countries can provision local presence numbers in each market without waiting on inventory. See the full network coverage for available markets.

The Hybrid Approach for Agencies

Many agencies run a mixed model: LC Phone for SMS-heavy accounts and inbound-dominant sub-accounts; BYO SIP for dedicated outbound teams where the flat-rate math works. GHL's BYOC setting operates at the sub-account level, so the configurations do not conflict.

For the outbound-heavy accounts, the UnlimCall pricing structure supports per-seat billing that maps cleanly to GHL's sub-account model — one sub-account, one seat count, one monthly number.

The GoHighLevel SIP trunk connection guide covers the provisioning steps in detail.