sip.audio is a professional real-time audio transport network operated by In:Quality Limited. Its core proposition is letting studios, journalists, presenters, remote engineers, sports venues, and other audio endpoints connect via simple [email protected] addresses. It is not a traditional email, SMS, or IM platform, but a SIP and EBU N/ACIP network for broadcast-grade voice and audio links, positioned as a modern replacement for ISDN.
In terms of connectivity, the platform is built around voice and professional audio, with support for EBU Tech 3326 / N/ACIP, SIP, STUN/TURN, Direct Media, and ISDN legacy connectivity. Supported audio codecs include OPUS, G711, G722, AAC, MPEG, PCM, Enhanced APT-X, and iLBC. The vendor specifically encourages the use of OPUS to improve interoperability and reliability across devices. For coverage, the site claims a worldwide network and lists server locations including Denver and Los Angeles in the United States, Manchester in the United Kingdom, Nuremberg in Germany, Sydney in Australia, Tokyo in Japan, and Sao Paulo in Brazil.
The pricing page shows plans starting at Β£5/month. Billing can be configured based on the number of SIP usernames, Tel calling features, non-US mobile calling bundles, dedicated numbers, Send a Link browser-based connection capability, and support level, with monthly and annual payment options available. However, the captured content does not include full tiered pricing, per-minute rates, or supported payment methods. In terms of integration, sip.audio is more about device and protocol compatibility than a SaaS API: it is designed to work with N/ACIP-compatible equipment, SIP clients, and some ISDN/POTS scenarios.
Its strengths are a clear industry focus, compatibility with the broadcast audio equipment ecosystem, support for global nodes, and multiple codec options, making it practically valuable for organizations phasing out ISDN. Its limitations are the lack of disclosed SLA, latency, availability, or outage compensation terms, as well as no clear information on access from mainland China, payment methods, or local compliance. It is also not suited to typical business notification, marketing SMS, or email delivery use cases.
sip.audio is best suited to radio stations, production companies, remote interview teams, recording studios, and professional audio users who need a low-friction way to set up remote live links. Access from mainland China is unknown. The site does not provide ICP filing information, mainland China nodes, RMB payment support, or China-specific compliance details. If the project will be deployed in China, it is advisable to first test network latency, packet loss, and payment feasibility, and compare it with ipDTL, hybrIP, traditional ISDN, or other SIP/N/ACIP solutions.
β This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on sip.audio official site.
sip.audio is an United Kingdom Comms & Email provider. TG4G tracks its product information, with monthly pricing from $6.30, an overall rating of 7.0/10, and a China-accessibility score of Workable. Click "Visit Official Site" to reach sip.audio directly.