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Your organisation’s PBX may be “old”, but if it routes calls reliably, supports critical dial plans, and integrates with business processes, it is still an asset. The pressure point is no longer basic telephony—it is user expectations: remote work, browser calling, and device flexibility.
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As we progress through 2026, enterprises increasingly recognise WebRTC as a cornerstone technology for modern communication infrastructure.
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A familiar pattern for PBX admins and VoIP engineers: the browser softphone works perfectly on office Wi-Fi, then fails the moment the same user switches to mobile data. Sometimes it connects but delivers one-way audio. Sometimes it rings and then drops. Sometimes it never progresses past “Connecting…”.
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In WebRTC-to-SIP environments SIP ALG often does the opposite of what you want: it rewrites signalling and SDP in ways that break ICE expectations, distort port mappings, and produce the classic “call connects but audio fails” outcome.
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Secure calling has two layers: protecting SIP signalling and protecting the media stream. While traditional SIP setups can mix RTP and SRTP, WebRTC browsers default to strict encrypted media, which can catch PBX environments off guard.
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One-way audio is frustrating because calls connect, but RTP/SRTP still fails — usually due to NAT, firewalls, ICE candidate selection, or inconsistent media anchoring in WebRTC-to-SIP setups.
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If you run a PBX, you’ve probably heard people talk about “WebRTC softphones” and “browser calling” as if they’re the same thing. Sometimes they are. Often, they’re not. And in the middle of it all you still have real users, a real Asterisk or FreePBX box, and the same uptime targets as always.
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If you have ever joined a video meeting that refused to connect, suffered from one-way audio, or dropped unexpectedly, there is a good chance the problem occurred before the call even started — at the network layer.
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Most WebRTC and VoIP conversations fail for one simple reason: devices can’t reach each other through firewalls and NATs. And the most important — and least understood — component solving this problem is the TURN server.
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When a modern business tries to connect browser users with SIP phones, PBX systems, mobile VoIP apps, or external carriers, something important has to sit in the middle — a WebRTC gateway. It’s the bridge that translates WebRTC’s encrypted, browser-native communication into traditional SIP/RTP, ensuring everything works smoothly.
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