Compare A2Billing vs. Kamailio in 2026

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Description

A2Billing serves as a class 4 and class 5 softswitch featuring inline billing capabilities, aimed at delivering VoIP services for residential, business, and wholesale markets, along with support for calling cards, call-back services, and telephone number resale, all underpinned by our expert support. This free and open source software, tailored for Asterisk, facilitates comprehensive telecom customer management through various interfaces, including those for administrators, agents, customers, and online signups, while offering adaptable inline rating and billing for calls and services in real-time, ensuring a seamless experience. Additionally, its robust features and support structure make it a popular choice for telecom providers looking to enhance their offerings.

Description

Kamailio® is an open-source SIP server, which evolved from the earlier OpenSER and SER, and is distributed under GPLv2+, capable of managing thousands of call setups each second. This robust platform can be utilized for constructing extensive systems for VoIP, real-time communication, presence, WebRTC, instant messaging, and various other applications. Additionally, Kamailio is well-suited for scaling SIP-to-PSTN gateways, PBX systems, or media servers such as Asterisk™, FreeSWITCH™, or SEMS with ease. Its extensive feature set includes support for asynchronous TCP, UDP, and SCTP, secure communication through TLS for voice, video, and text, as well as WebSocket compatibility for WebRTC. The server supports both IPv4 and IPv6, offers simple instant messaging and presence capabilities with an integrated XCAP server and MSRP relay, and enables asynchronous operations. Furthermore, it includes IMS extensions for VoLTE, ENUM functionality, DID and least cost routing, load balancing, and routing failover. Kamailio also provides comprehensive accounting, authentication, and authorization features, while supporting a variety of backend systems, including MySQL, Postgres, Oracle, Radius, LDAP, Redis, Cassandra, MongoDB, and Memcached. All these capabilities make Kamailio a versatile choice for modern communication infrastructures.