A cross-border acquisition transfers more than shares and staff. The buyer also takes over phone numbers, email domains, call recordings, and the accounts that depend on them. Some of this can stay in place, while the rest should be replaced early, and buyers who need clean business lines during that period can set up GetTempNumber virtual numbers while the old ones are audited. This guide sorts the assets into what usually transfers and what is safer to replace.
What a Buyer Typically Inherits
Form an inventory before signing, as the seller’s configuration is distributed across different vendors, personal accounts, and local branches. Below is a table of the key resources and their associated problem in the international business setting:
| Asset | What the buyer takes over | Cross-border issue |
| Phone numbers | Local and national numbers customers already use and know | Per the IETF’s RFC 3482, number portability is supported within a nation, so a number may not move to another country |
| Domains and DNS | Website, brand and email domains | ICANN’s Transfer Policy requires an authorisation code for transfers and a 60-day lock after a registrant change, unless the holder opted out beforehand |
| Call recordings and contacts | Personal data held by phone and CRM vendors | Moving EU data to a third country needs a lawful mechanism, such as the Commission’s standard contractual clauses |
| Numbers for login codes | Phones that receive security codes | NIST SP 800-63B-4 restricts phone-network (SMS and voice) codes and prohibits email for this use |
| Vendor contracts | Phone system, cloud phone and carrier agreements | Assignment and change-of-control clauses can limit transfer, so counsel should review them |
Numbers and contracts decide how fast calls can move to the buyer’s systems. Domains and data decide who controls the brand and its records. Rank the assets by customer impact and fix the highest first.
What to Replace First
Some items should not carry over even when they work, because the seller’s staff and vendors may still have access. Replace these first:
- Administrator logins for phone systems, domain registrars, and email, swapped for named accounts owned by the buyer.
- Numbers that receive login codes, moved to a method tied to a specific device.
- Personal or shared mobile numbers used for business accounts.
- Call-routing rules that still point to the seller’s offices.
The current guidelines of NIST SP 800-63B-4 state that email “SHALL NOT be used for out-of-band authentication” and “use of the public telephone network for this purpose is restricted.” Alternative authenticators are required to be provided by the verifier. It is important to migrate your login codes to the authenticator app or security key before making any changes to your number.
Data and Recording Rules That Cross Borders
Call recordings and the contact list are considered personal data. When an entity from Europe gets acquired by a company that operates beyond the EU/EEA territory, a basis for transferring that type of information is required. Standard contractual clauses adopted by the Commission on 4 June 2021 could be a pre-approved solution for the transfer of data to controllers and processors based outside of the EU/EEA.
There are some differences in regard to the legislation on recording as well. In the United States, most of the states apply one-party consent, while some other states apply the two-party consent legislation, and the federal wiretap act is considered a one-party consent legislation as well. Thus, a recording notice prepared for the seller’s state may not suit the callers from another state.
Decide Whether to Port, Keep or Retire Numbers
Each of these numbers will have its own judgment according to the way it is used by the customers. To begin with, extract call volumes for all the lines from the carrier of the seller, and observe which of those numbers is found on any contract, advertisement, invoice, or signboard. The number found on a material difficult to replace requires more consideration than one that customers seldom call. As per the following table:
| Decision | When it fits | Watch for |
| Port to the buyer’s carrier | The number is printed on contracts, ads, or signs | Portability works within a nation (RFC 3482), so check the destination country |
| Keep with the seller’s carrier for a set period | Short-term continuity matters | The transition services agreement must cover it, with an end date |
| Forward, then retire | The number has little traffic | Forward long enough for customers to switch |
Document each decision with an owner and date. This will ensure that each number doesn’t go past the deadline date unnoticed.
Request from the seller’s carrier the end date and notice period of each line. This will help to prevent lines that expire during the transition period from cutting off customers without notice. Send the final list to sales, support, and finance.
A 30-Day Checklist
A fixed sequence limits gaps in service. It also gives both sides a shared plan for the first month after closing. Work through the steps in this order:
- Generate a list of numbers, domains, mailboxes, and vendors along with the respective account managers.
- Remove administrator logins and transfer logins to devices.
- Ensure contracts and data transfers are in accordance with the agreement with counsel.
- Establish a separate line of business and routing during the migration process.
- Forward critical numbers and check call functionality in both directions.
- Change recording messages and scripts according to the country being served.
Close the month by reviewing call logs for missed or misrouted calls. Anything still pointing to the seller’s systems should be fixed before the transition agreement ends.
When buying an enterprise in another country, you get the company’s phone numbers, domain names, databases, and access rights together with the employees. Make a list of all the assets before completing the deal, change the administrator access rights first, and assign a manager to each phone number and date.
