What telecom software does CelloIP build?
CelloIP Technologies builds carrier-grade telecom software for MNOs, MVNOs, CLECs, and ITSPs including Class 4/5 softswitches on FreeSWITCH and OpenSIPS, VoIP billing platforms, DID management systems, Session Border Controllers, LNP implementation, and UCaaS platforms. All solutions are built on open-source VoIP technology with full source code ownership.
Carrier-Grade Telecom Software Development
CelloIP builds production VoIP infrastructure for MNOs, MVNOs, CLECs, and ITSPs — Class 4/5 softswitches, billing platforms, SBC, LNP, DID management, and UCaaS. Open-source stack, full IP ownership.
MNO / MVNO
Mobile network and virtual operators needing VoIP overlay, Wi-Fi calling (VoWiFi), IMS integration, and subscriber self-service portals.
CLEC / ITSP
Competitive local exchange carriers and internet telephony service providers needing SIP trunking, LNP, interconnect billing, and regulatory compliance tooling.
Wholesale Carrier
Transit and termination carriers requiring high-throughput Class 4 softswitches, LCR engines, fraud management, and interconnect CDR exchange.
Hosted PBX Provider
UCaaS and hosted PBX providers needing multi-tenant FusionPBX deployments, white-label portals, provisioning APIs, and per-tenant billing.
Telecom Platform Solutions
Class 4 / Class 5 Softswitch
Carrier-grade softswitch development on FreeSWITCH or OpenSIPS. Class 4 for wholesale transit routing with LCR, and Class 5 for retail subscriber services — extensions, voicemail, IVR, conferencing.
Telecom Billing System
Custom VoIP billing platform with real-time rating, prepaid/postpaid account management, invoice generation, CDR import from Asterisk/FreeSWITCH, payment gateway integration, and reseller margin management.
DID Management Platform
End-to-end DID (Direct Inward Dialling) inventory management: number provisioning, carrier integration via SIP, porting workflows, E.164 routing, and reseller assignment portal with white-label branding.
Session Border Controller
Enterprise and carrier SBC on OpenSIPS or Kamailio: topology hiding, codec normalization, DoS protection, STIR/SHAKEN attestation, TLS/SRTP encryption, and carrier peering configuration.
UCaaS Platform Development
Unified Communications as a Service platform for ITSPs and MVNOs: hosted PBX, video conferencing, team messaging, mobile app, admin portal, and usage-based billing — white-label deployable.
Number Portability (LNP)
Local Number Portability implementation for CLECs: LNP query integration (NPAC via SOAP/REST), route-on-LNP configuration in OpenSIPS/Kamailio, porting workflow management, and carrier coordination.
Regulatory Compliance Expertise
Telecom operators face a complex and jurisdiction-specific regulatory landscape. CelloIP engineers understand the technical implementation requirements for the most common telecom compliance mandates — and build them into platforms from day one, not as expensive retrofits.
All Carrier Client Types
MNO / MVNO
Mobile network and virtual operators needing VoIP overlay, Wi-Fi calling (VoWiFi), IMS integration, and subscriber self-service portals.
CLEC / ITSP
Competitive local exchange carriers and internet telephony service providers needing SIP trunking, LNP, interconnect billing, and regulatory compliance tooling.
Wholesale Carrier
Transit and termination carriers requiring high-throughput Class 4 softswitches, LCR engines, fraud management, and interconnect CDR exchange.
Hosted PBX Provider
UCaaS and hosted PBX providers needing multi-tenant FusionPBX deployments, white-label portals, provisioning APIs, and per-tenant billing.
SMS/Messaging Provider
A2P and P2P messaging providers needing SIP SMS gateway development, SMPP integration, throughput rate management, and delivery reporting.
IoT / M2M Carrier
IoT connectivity providers needing SIM management, data rating, voice-over-LTE integration, and M2M protocol bridging to SIP networks.
Relevant Technical Services
Class 5 Softswitch
Retail subscriber VoIP platform
VoIP Billing Software
Real-time rating, invoicing, CDR
OpenSIPS SBC & Proxy
Carrier-grade SIP routing
SIP Trunk Solutions
Carrier interconnect & PSTN
Kamailio Development
SIP registrar, LCR routing
FreeSWITCH Development
Class 4/5 softswitch core
VoIP Development
Full-stack platform engineering
Hire VoIP Developers
Dedicated carrier engineers
Open-source technologies we use:
Build Your Carrier VoIP Platform
Free carrier assessment call with a CelloIP telecom architect. We review your routing, billing, and compliance requirements and provide a technology roadmap.