BT Cloud Phone

Secure Voice and SIP over TCP in BT Cloud Phone

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SummaryThis article provides information on secure Voice and SIP over TCP.

BT Cloud Phone includes a number of features which improve call quality and security protocols, such as Secure Voice and SIP over TCP. The BT Cloud Phone system supports secure VoIP calls across all supported desk phones, conference phones, mobile and desktop apps.

Click the topics below to learn more about Secure Voice and SIP over TCP:

What is Secure Voice
What is SIP over TCP

What is Secure Voice

Secure Voice is a feature that adds robust security protocols to both signalling and media for supported endpoints.  Secure Voice uses two enterprise-grade security protocols (TLS and sRTP) to provide additional security for phone calls.  

Transport Layer Security (TLS) is a cryptographic protocol that provides encryption on the SIP signalling data in the application layer. This protocol secures the SIP signalling communication between supported endpoint devices and the BT Cloud Phone servers.

Secure Real-time Transport Protocol (sRTP) is a profile of the Real-time Transport Protocol (RTP) that provides encryption, message authentication and integrity, as well as replay protection to the RTP packet stream that is transported between supported endpoint devices and the BT Cloud Phone servers.

What is SIP over TCP

BT Cloud Phone supports Session Initiation Protocol (SIP) signalling over the Transmission Control Protocol (TCP). SIP lets you run numerous communications applications over your IP network or internet connection. In other words, you can make voice calls over the internet. The TCP protocol provides reliable, ordered, and error-checked delivery of packet streams between supported endpoints and the BT Cloud Phone servers. This means improved call signalling resulting in fewer dropped calls, reduced one-way audio issues, improved firewall compatibility, improved call handling capabilities over wireless, and is generally better able to withstand packet loss in high traffic office environments or while using mobile devices on bandwidth-limited wireless networks.

Steps To Reproduce
Affected Environment
TitleSecure Voice and SIP over TCP in BT Cloud Phone
URL Name8098
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