Loading Calculator...
Operational Consent Required
We use telemetry and cookies to optimize your signaling calculation experience. Enabling data streams helps us fund mission-critical R&D.
Network function sizing utility for IMS Core (3GPP TS 23.228), calculating P-CSCF, S-CSCF, I-CSCF, and HSS capacity for VoLTE and VoNR subscriber populations.
IMS dimensioning estimates P/I/S-CSCF scale from VoLTE/VoNR busy-hour call and registration models so core voice stays within SIP TPS and session budgets.
The dimensioner maps subscriber behavior (registration interval, BHCA, call hold time) to SIP transaction rates per IMS function, applying standard oversubscription and redundancy models.
Built on 3GPP Technical Specifications, ensuring accuracy for production deployments and security audits.
Calculations specifically designed to identify protocol vulnerabilities and signaling misconfigurations.
Compliant with 3GPP TS 23.228 IMS architecture. Critical for VoLTE launch planning and VoNR 5G SA core upgrades where IMS must scale to carry all mobile voice traffic.
Edge-V8 Isolate
Technical Audit
< 50ms (Global)
Secured by Auth0
500k VoLTE subs, 1.2 BHCA/sub, mean 80 s hold → offered Erlangs and invite rates drive S-CSCF session and TPS needs after applying your SIP message mix.
Excludes full MRF/MGCF/TAS mesh detail. Extend with vendor worksheets for those NFs.
Typically P-CSCF, I-CSCF, and S-CSCF capacity from BHCA, registration rate, and concurrent session assumptions for VoLTE/VoNR.
Each call attempt and registration triggers multiple SIP transactions. Convert BHCA into peak SIP TPS with procedure multipliers from your call model.
Access SBCs often sit with or in front of P-CSCF. Size them on concurrent sessions and SIP TPS separately, then align.
Calculate required SIP trunks based on traffic parameters and quality requirements.
Classic tool for determining circuit requirements with zero queuing.
Estimate Opus codec nominal bitrates and total IP bandwidth including RTP/UDP/IP overhead.
Deep-Dive Into Carrier VoIP & IMS Architectures
Understand the core call flow mechanics. Learn SIP signaling optimization, IMS dimensioning standards, and media transport encryption directly on TelcoSec Academy.
SSO Link: Academy Node 0x93FF