MOR vs. M4 SBC

Not sure what the difference is between Kolmisoft Softswitches MOR, and M4 SBC?

Check this comparison table and choose which Softswitch meets your needs better.


Comparison Table: MOR and M4 SBC

Description MOR M4 SBC

Product focus

MOR includes all services in a single softswitch: retail, wholesale, SIP trunking, managing DIDs, Resellers, PBX features, etc. M4 SBC is for wholesale transit and selling voice traffic to call centers.


MOR is based on Asterisk, which is one of the most popular frameworks for building communications applications. Even though Asterisk is flexible and allows many services under one platform, but it cannot handle high call volumes. M4 SBC is based on Kamailio, SEMS and RTPEngine. The architecture of M4 SB is very robust, powerful and scalable. As a result, you can send huge call volumes with confidence and grow your business easily.


MOR single-server solution – up to 500 concurrent calls, up to 50 CPS (most of the time it’s closer to 20). MOR multi-server solution – up to 2000 concurrent calls, up to 100 CPS. M4 single-server solution – up to 500 concurrent calls, up to 100 CPS. M4 multi-server solution– up to 10 000 concurrent calls, up to 1000 CPS.

A list of the main features

MOR features M4 SBC features

Hardware requirements

Hardware requirements for MOR Hardware requirements for M4 are the same, just in addition to this, we recommend the specific NIC if you need over 700 concurrent calls: Intel I210, I350, X550T.

Implementations (topologies)

MOR implementations M4 implementations

Documentation (manual)

MOR documentation M4 SBC documentation (M2 is the former name of M4)

Signaling protocols

SIP, H323, IAX2


Username/password and IP authentication



SIP trunking



Services (subscriptions, one time fees, flat rates)

✔️ Coming Soon

DID management

✔️ Coming Soon
Automatic Tariff Import ✔️ ✔️
Advanced Routing Addon ✔️ It is a default feature in M4
Auto-Dialer Addon ✔️
Call Shop Addon ✔️
Callback Addon ✔️

Calling Cards Addon ✔️

Mobile Number Portability Addon ✔️ Available. Learn more about MNP in M4.
Monitorings Addon ✔️ All features of this add-on (Alerts, Blocked IPs, Blocked Countries) are available by default, except Spy real time calls is not supported
Multi-Level Resellers Addon ✔️
Reseller Addon ✔️
Reseller Pro Addon ✔️
Payment Gateway Addon ✔️ M4 currently supports only PayPal add-on
PBX Functions Addon ✔️
Provider Billing Addon ✔️
Recordings Addon ✔️
TLS/SRTP support ✔️
Rate notifications ✔️

Wondering where to start?

Here are some useful resources: