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Enabling analogue voice service delivery over a fibre connection

What it is

A wholesale standard for VoIP access services using the UFB Voice Access Service specifically on Session Initiation Protocol (SIP) Loose Coupling implementation.


An updated TCF SIP ATA Standard for LFC Wholesale Service (Loose Coupling).

Public Consultation

The TCF has developed a draft TCF SIP ATA Standard for LFC Wholesale Service (Loose Coupling) and is now issuing it for public consultation.

You are invited to examine the draft document and provide your feedback.

If you wish to make a submission, please note that the closing date is 5.00pm, Friday 19 August 2022. Please send your submission via email to

Please note that unless stated otherwise, all submissions will be regarded as public and will be published on the TCF website.

Who it applies to

Service Providers who wish to provide analogue voice over fibre.

Who it Affects

  • Service Providers of fibre telecommunications services
  • Local Fibre Companies

Working Party Establishment

The original document was approved by the TCF in March 2015.

The Working Party was re-established to review the document. The review is focussed on removing reference to the obsolete RFC 2833 specification and updating with reference to RFC 4733 for DTMF RTP Event Handling. 

Working Party Members

Last Modified On Wednesday, 27 July 2022