https://www.slab.org.uk/guidance/rates-allowable-and-information-you-should-provide-with-the-account-entry-for-telephone-calls/
A telephone call is only chargeable at one of the rates prescribed in the Table of Fees in Part 2 of Schedule 3 of the Advice and Assistance (Scotland) Regulations 1996, as follows:
Standard charges, based on five or six minute units, perhaps in the use of a time recording system, are contrary to the basis of the fees set out in the Table of Fees. Where it is unclear how long a telephone call lasted or there is insufficient narrative to support a charge, we will only allow a charge at the lowest rate.
No charge can be allowed for a telephone call where:
You are not providing advice and assistance.
We can exceptionally allow a charge for a telephone call where you leave a message on an answering machine or with someone other than the intended recipient of the call but, in the process indirectly provide the assisted person: