What is SRTP in one sentence?

It's the protocol that encrypts the audio of a VoIP call.

Is SRTP automatic on every Offshorevoip call?

SRTP is available on every plan, but your client must be configured to use it. TLS signaling is available from Business.

What's the difference between SRTP and TLS?

SRTP encrypts the audio; TLS encrypts the SIP signaling that sets up the call.

Does SRTP affect call quality?

Not noticeably. The encryption overhead is small on modern devices.

what is srtp

What is SRTP?

By Offshorevoip Network Desk·Voice infrastructure editorial·Last updated: 2026-09-29

TL;DR

SRTP (Secure Real-time Transport Protocol) encrypts voice media streams so call audio is protected in transit. It is often paired with TLS for signaling.

Definition

what is srtp: SRTP (Secure Real-time Transport Protocol) encrypts and authenticates the audio stream of a VoIP call; it is usually paired with TLS, which encrypts the SIP signaling.

Media

What SRTP protects

The audio packets

Signaling

What TLS protects

Call setup, numbers, credentials

All plans

SRTP at Offshorevoip

TLS from Business

Standard RTP carries voice packets in the clear unless secured. SRTP adds encryption and integrity protection to real-time media.

Offshorevoip offers encrypted VoIP paths (SRTP/TLS depending on plan and endpoints) while keeping No KYC activation — privacy at both account and media layers when scoped.

“SRTP without TLS protects the audio but not the call details. Use both when privacy matters.”

Offshorevoip Network Desk·Voice infrastructure editorial

Definition in a private desk setup

A VIP support line requires encrypted media. Softphones and trunks are configured for SRTP; signaling uses TLS where supported. Account activation still skips identity KYC.

Media encryption
Endpoint support required
Plan-dependent
No KYC still applies

How to enable SRTP on a softphone

1Set the SIP transport to TLS (Business plan or higher).
2Set media encryption to SRTP (mandatory, not optional).
3Save and re-register the account.
4Place a test call and check that the client shows an encrypted call.

SRTP vs related controls

Control	Protects / governs
SRTP	Call audio media
TLS (SIP)	Signaling channel
No KYC policy	Account identity gates
AUP	Lawful use

Source: Offshorevoip product policy · Updated 2026-09-29

FAQ: what is srtp

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SRTP/TLS options with No KYC activation.

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