SIP trunking for 3CX in Saudi Arabia

Connect an STC SIP trunk to 3CX in Saudi Arabia

ECOLOR configures your licensed Saudi carrier SIP trunk on 3CX — trunk credentials, codecs, DID mapping, caller ID and call routing — so you can lower call costs, scale channels on demand and keep your existing numbers.

Works with STC (stc Business), Mobily, Salam (ITC) and Zain. On-prem or hosted 3CX.

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STC / Mobily / Salam / Zain
Works with 3CX
Keep your numbers

What is an STC SIP trunk for 3CX?

An STC SIP trunk is a voice service from stc Business that connects your 3CX phone system to the public telephone network over the internet, replacing legacy E1/PRI or analog lines. It carries your inbound and outbound calls as SIP over IP, so a single connection handles many simultaneous calls without physical phone lines.

On 3CX, the trunk is added as a VoIP provider (SIP trunk) using registration or IP-authentication credentials issued by the carrier. Once registered, your 3CX extensions, IVRs and queues place and receive calls through the carrier’s network. STC is the largest Saudi carrier and explicitly markets SIP trunking for business, alongside 9200 and 800 service numbers, but the same 3CX integration approach also applies to Mobily, Salam (ITC) and Zain.

ECOLOR configures the carrier trunk on 3CX end to end: trunk credentials and registration, codec selection, DID (number) mapping to extensions or queues, outbound caller ID (CLI) per department, inbound routing to your IVR, and outbound dial rules. The result is a compliant, cost-efficient voice connection that uses a CST-licensed Saudi carrier rather than unlicensed international SIP.

Because the trunk terminates on your 3CX system, it also unlocks everything 3CX does with a call once it arrives: multi-level IVR menus, ring groups and call queues, business-hours and out-of-hours routing, call recording, and reporting. The SIP trunk is simply the external line into that system, so a well-planned trunk and DID map is what lets a single connection serve reception, sales, support and multiple branches from one 3CX instance.

Replaces E1/PRI/analog lines with SIP over the internet
Uses a licensed Saudi carrier: STC, Mobily, Salam or Zain
Configured on 3CX as a VoIP provider (SIP trunk)
Supports DIDs, caller ID (CLI), IVR routing and dial rules

What an STC SIP trunk on 3CX gives you

Carrier SIP trunk

A licensed Saudi carrier trunk (STC, Mobily, Salam or Zain) registered on 3CX to carry all your inbound and outbound calls over IP.

Lower call costs

SIP trunking typically reduces per-minute and line-rental costs compared with legacy E1/PRI, and consolidates multiple lines into one connection.

Channels scale on demand

Add or remove simultaneous call channels as your team grows, without installing new physical lines for each seat.

Keep your numbers

Port your existing landline and service numbers to the carrier trunk, so customers keep dialling the numbers they already know.

3CX configuration

ECOLOR sets up trunk registration, codecs, DID mapping, outbound CLI, inbound routing to IVR/queues and outbound dial rules on 3CX.

Secure & compliant

Trunks are configured securely on a CST-licensed carrier, with SIP hardening so local Saudi calling stays reliable and compliant.

Saudi SIP trunk carriers

Carrier	Notes	Works with 3CX
STC (stc Business)	Largest; markets SIP trunking, 9200 & 800	Yes
Mobily	Enterprise voice	Yes
Salam (ITC)	Strong in Eastern Province	Yes
Zain	Competitive enterprise plans	Yes

stc pay is a wallet, not a SIP product.

How ECOLOR sets up your SIP trunk

Qualify the carrier & channels
We help you choose and qualify a licensed carrier (STC, Mobily, Salam or Zain) and size the number of simultaneous channels you need for peak concurrency.
Order the trunk & numbers
You order the SIP trunk and DIDs from the carrier; we specify the technical requirements and, where needed, plan number porting for your existing numbers.
Configure the trunk on 3CX
We add the carrier as a VoIP provider on 3CX, set registration/authentication, codecs and SIP security so the trunk registers reliably.
Map DIDs, CLI & routing
We map each DID to the right extension, IVR or queue, set outbound caller ID (CLI) per department, and build outbound dial rules.
Test & go live
We test inbound and outbound calls, verify caller ID, routing and audio quality, then cut you over to the new trunk and monitor go-live.

How a SIP trunk connects

Public phone networkSaudi carrier SIP trunkYour 3CX systemExtensions, IVR & queues

What you need

A licensed Saudi carrier SIP trunk (STC, Mobily, Salam or Zain)
3CX system (on-prem or hosted)
Number of simultaneous channels for peak concurrency
DIDs / numbers (new or ported from your current provider)

Not sure how many channels or which carrier fits? ECOLOR will help you qualify the carrier and size the trunk before you order.

Saudi deployment notes & limits

Use a CST-licensed carrier for local Saudi calling. SIP trunking depends on a licensed carrier; using unlicensed international SIP for local Saudi numbers risks service interruption, so the compliant path is a CST-licensed carrier such as STC, Mobily, Salam or Zain.

Size channels for peak concurrency, not headcount. The number of simultaneous channels you need is driven by how many calls happen at the same time during your busiest period — not the total number of extensions. Under-sizing causes busy tones at peak; ECOLOR helps you estimate concurrency and add channels as demand grows.

Plan number porting early. If you want to keep existing landline or service numbers, porting to the new carrier trunk is possible but takes coordination and lead time. ECOLOR maps your DIDs and caller ID so departments keep the right inbound and outbound identity through the switch.

Secure the trunk and allow the right network. A SIP trunk is an internet-facing voice service, so it should be hardened: restrict SIP traffic to the carrier’s IP ranges where the provider supports IP authentication, keep 3CX and its SBC updated, and avoid exposing SIP/RTP ports to the whole internet. Our SIP security guidance covers this in more depth; the goal is to prevent toll fraud and registration abuse while keeping call setup and audio (RTP) flowing cleanly.

Budget bandwidth per channel and monitor quality. Each concurrent call consumes roughly 85–100 kbps with the G.711 codec (less with G.729), so size your internet link and any QoS rules around your peak channel count, not the average. After go-live, ECOLOR checks registration stability, one-way-audio and NAT issues, and call quality so problems are caught before they reach customers.

Frequently asked questions

Does STC offer SIP trunking?

Yes, via stc Business. STC is the largest Saudi carrier and explicitly markets SIP trunking for business, along with 9200 and 800 service numbers. ECOLOR configures the STC trunk on your 3CX phone system.

Can I keep my current numbers?

Yes, via porting. Your existing landline and service numbers can generally be ported to the carrier SIP trunk so customers keep dialling the same numbers. ECOLOR plans the porting and maps each number to the right extension, IVR or queue.

How many channels do I need?

Size channels for peak concurrency — the number of calls happening at the same time during your busiest period, not your total headcount. ECOLOR helps you estimate this and you can scale channels up or down on demand.

Does a SIP trunk work with hosted 3CX?

Yes. A carrier SIP trunk works with both on-premises and hosted (cloud) 3CX. The trunk is configured the same way as a VoIP provider on 3CX regardless of where the system runs.

Is stc pay a SIP trunk?

No — stc pay is a fintech wallet, not a voice or SIP product. The SIP trunking service comes from stc Business. Do not confuse the two when ordering.

Can I use Mobily, Salam or Zain instead?

Yes. Mobily, Salam (ITC) and Zain are licensed Saudi carriers that also work with 3CX. ECOLOR helps you compare and qualify the best fit, then configures the chosen trunk.

Is unlicensed international SIP okay for local calls?

No — use a CST-licensed carrier. Unlicensed international SIP for local Saudi numbers risks interruption. The compliant, reliable path for local calling is a CST-licensed Saudi carrier trunk.

Connect a Saudi SIP trunk to 3CX with ECOLOR

As a MENA 3CX Solution Provider, ECOLOR qualifies your licensed carrier, sizes your channels, configures the trunk on 3CX and handles DID mapping, caller ID, routing and number porting — so your voice runs on a compliant, cost-efficient Saudi SIP trunk.