TFNRegistry API: Are Concurrent Requests Supported? March 20, 2026 16:16 Updated Yes. Concurrent requests are supported. Related articles TFNRegistry API: What is Optimistic Locking and recVersionId? TFNRegistry UI: What are the Fields, their Descriptions and Valid Values for the GAN Page? TFNRegistry UI: What are the MNC Request Type Fields, their Descriptions and Valid Values for the BMC Page? How Much does it Cost to Get a Toll-Free Number for my Business? What is a Resp Org?