Aviz Service Nodes details ASN-DPI export of SIP and RTP metadata

Aviz Service Nodes' ASN-DPI exports Session Initiation Protocol (SIP) and Real-time Transport Protocol (RTP) metadata to provide real-time insight into call negotiation, media paths, and voice quality without exposing payloads or installing endpoint agents, aiding enterprise teams in faster Voice Over Internet Protocol (VoIP) troubleshooting.

Research overview

Enterprise voice systems use SIP for signaling and RTP for media, and existing monitoring approaches often lack protocol-level context for call setup and media behavior. ASN-DPI addresses that gap by exporting selected metadata from SIP and RTP streams while omitting media payloads.

Technical breakdown

SIP metadata exported by ASN-DPI includes session identifiers, traffic direction, Session Description Protocol (SDP) attributes such as media counts, transport details, and the IP and port information advertised for media endpoints. These fields also surface offered formats and codec identifiers to validate negotiation and detect incompatibilities or misconfigurations.

RTP metadata captures stream-level identifiers, sender and receiver session markers, sequence numbers, timestamps, and expected versus observed packet intervals. ASN-DPI continuously derives metrics from these values, including packet loss, jitter in milliseconds, packet reordering, and duplicate packet counts.

Key findings

Linking SIP signaling and RTP media via a shared session identifier produces end-to-end visibility of the full call lifecycle and allows clear separation of signaling issues from media impairments. The correlated view supports agentless monitoring across the network and aims to shorten mean time to root cause.

Operational impact

With metadata exports, operations teams can validate firewall, Network Address Translation (NAT), and session border controller behavior against negotiated media parameters and identify whether quality issues stem from congestion, Wide Area Network (WAN) instability, or configuration errors. The approach reduces reliance on endpoint probes and provides continuous observability of Voice Over Internet Protocol (VoIP) traffic.

Product update

Aviz Service Nodes implement ASN-DPI to extract and stream SIP and RTP metadata for integration with monitoring and analytics systems without transmitting payload content. The feature set targets visibility into negotiation outcomes and media performance across enterprise networks.

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