# BT-42 — Seller contact telephone number

> https://billhorse.com/en/terms/bt-42/

Phone number of the seller contact. Mandatory in XRechnung (BR-DE-6).

## Where does it live in the XML?

- UBL: `cac:AccountingSupplierParty/cac:Party/cac:Contact/cbc:Telephone`
- CII: `rsm:SupplyChainTradeTransaction/ram:ApplicableHeaderTradeAgreement/ram:SellerTradeParty/ram:DefinedTradeContact/ram:TelephoneUniversalCommunication/ram:CompleteNumber`

## Checked by these rules

- [BR-DE-6 — Contact phone missing (XRechnung)](https://billhorse.com/en/rules/br-de-6/)