Protocols & Standards
SIP, SDP, RTP, SMPP, SS7 and the standards behind modern communications.
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Understand SIP.
From signalling to operations.
Protocol guide · 25 min read
The Complete SIP Protocol Guide
A practical, standards-based guide to SIP architecture, messages, methods, transactions, dialogs, call flows, SDP, RTP, routing, NAT, security and troubleshooting.
Read the guide ↗Published guides
Technical library.
01
SIP Protocol Guide
SIP architecture, messages, methods, response codes, call flows, SDP, routing and troubleshooting.
Read guide ↗02VoIP Technologies & Protocols
Signalling, media, codecs, quality, interconnection, security and operational resilience.
Read guide ↗03SMS Technologies & Protocols
SMPP, SS7/MAP, SMSCs, delivery receipts, encoding, throughput, routing and traffic integrity.
Read guide ↗04SIP Troubleshooting Guide
Causes, diagnostic checks and fixes for registration, routing, media, NAT and signalling failures.
Read guide ↗05SIP Call Flows & Ladder Diagrams
Visual message sequences for setup, early media, cancellation, hold, transfer and teardown.
Read guide ↗06SMPP Protocol & Error Codes
Binds, PDUs, receipts, command-status errors, throughput, windowing and resilient operations.
Read guide ↗07DID, Toll-Free & ITFS Guide
Number types, SIP routing, voice and SMS capabilities, compliance and procurement.
Read guide ↗Content directory
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Voice Engineering
Carrier interconnection, routing, quality, CLI integrity and international voice operations.
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A2P, P2P and P2A messaging, delivery architecture, throughput and route optimisation.
Security & Fraud
Telecommunications security, traffic integrity, monitoring, fraud controls and resilience.
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Cloud communications, intelligent automation and practical applications of artificial intelligence.
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Commercial development, partnerships, product strategy and sustainable telecommunications growth.
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