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Hosted Dialer
Launch outbound call campaigns with cloud-based auto and predictive dialing.
Media Proxy
Low-latency RTP relay that keeps voice clean and private
A media proxy sits between your endpoints and the wider internet, relaying RTP through hardened, well-peered nodes. It solves NAT traversal, hides your infrastructure topology, and shortens the media path so audio arrives clean.
No more one-way audio
Full NAT traversal and media anchoring for endpoints behind any firewall.
Topology hiding
Your SBC, PBX and agent IPs stay invisible to upstream carriers and attackers.
Measurable call quality
Per-call MOS, jitter and packet-loss metrics on every relayed stream.
Overview
How Media Proxy works
Direct endpoint-to-endpoint media works fine until it does not — symmetric NAT, asymmetric routing, and carriers that will not accept media from an unknown IP all produce the same symptom: one-way or no audio. VoipXDialer Media Proxy terminates and re-originates the RTP stream at a point of presence close to both legs, so signalling and media follow a path you control.
Beyond connectivity, the proxy is where you enforce policy. Encrypt with SRTP on the public leg, transcode between codecs when the far end will not negotiate, anchor media for lawful recording, and expose per-call jitter, loss and MOS so quality problems are diagnosed with data instead of guesswork.
Capabilities
What you get with Media Proxy
SRTP encryption
Encrypt media on the public leg and terminate cleanly toward legacy peers.
NAT traversal
Handles symmetric NAT, ICE and asymmetric RTP without endpoint changes.
Codec transcoding
Bridge G.711, G.729, OPUS and G.722 when the far end will not negotiate.
Low-latency PoPs
Well-peered nodes across multiple regions keep the media path short.
Quality telemetry
MOS, jitter, packet loss and RTCP data captured per call leg.
Topology hiding
Upstream carriers only ever see the proxy, never your core infrastructure.
Media anchoring
Anchor streams for centralised recording and compliance capture.
Horizontal scaling
Add relay capacity per region as concurrent session counts grow.
Who it is for
Built for teams like yours
Media Proxy is deployed most often by the operations below — though the platform is flexible enough for anything voice-shaped.
- Fixing one-way audio between endpoints behind restrictive NAT
- Hiding core VoIP infrastructure from upstream carriers
- Meeting SRTP encryption requirements on public network legs
- Centralising call recording for compliance
- Diagnosing quality complaints with per-call MOS evidence
Technical specification
The detail
Everything your engineers will ask for on the first call.
- Protocols
- RTP, RTCP, SRTP, ICE/STUN/TURN
- Codecs
- G.711 a/µ-law, G.729, OPUS, G.722, passthrough
- Transport
- UDP, TCP, TLS signalling interworking
- Metrics
- Per-leg MOS, jitter, loss, RTCP reporting
- Deployment
- Multi-region PoPs with regional pinning
- Scaling
- Horizontal, per-region session capacity
Customer stories
Teams already running this
We moved 140 agents off an on-premise dialer in under three weeks. Talk time per agent went up by roughly 40% in the first month, and we finally stopped losing mornings to hardware faults.
Local DIDs across twenty-two states from one portal, one invoice and one support contact. Our answer rates climbed the moment we switched to matched area codes in each market.
Questions
Media Proxy FAQs
Most commonly one-way or no audio caused by NAT and asymmetric routing. It also hides your infrastructure from upstream peers, enforces encryption, and gives you a single point to measure and record media.
The added latency is minimal because relay nodes sit in well-peered points of presence close to both call legs. In poorly-routed scenarios the proxy often improves quality by shortening the effective media path.
Yes. It bridges G.711, G.729, OPUS and G.722, which is essential when one side refuses to negotiate the codec the other requires.
No. The proxy can handle media only while your existing signalling path stays exactly where it is.
Every relayed leg reports MOS, jitter and packet loss, so you can compare before and after with real numbers rather than anecdotes.
Works well with
Pairs naturally with
Most customers combine Media Proxy with at least one of these.
02
Local Number Services (DID)
Get instant access to local numbers in all 50 US states.
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Hosted PBX
Run your business phone system in the cloud with full control and zero hardware.
Get started with Media Proxy
Talk to a specialist about your volumes, destinations and timelines. Trial accounts are usually live the same business day.