Per RFC 4694, a node that performs the dip and retrieves a routing number must add both the 'rn' and the 'npdi' parameters to the tel URI.
Checked 2026-10-02
- Vendor
- not restricted
- Product
- not restricted
- Subsystem
- sip-signalling
- Deployment
- sip
- Region
- not restricted
- Release range
- RFC 4694
- Checked
- 2026-10-02
Sources
- RFC 4694: Number Portability Parameters for the "tel" URI — IETF / RFC Editor · tier 1 standards and regulators · RFC 4694 Section 5.2.1
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting calls that fail to ported numbers after cutover: source note post-port-routing-troubleshooting-rfc4694-dip-adds-rn-npdi. WarmTransfer. https://warmtransfer.net/knowledge/claims/post-port-routing-troubleshooting-rfc4694-dip-adds-rn-npdi
BibTeX
@misc{warmtransfer-claim-post-port-routing-troubleshooting-rfc4694-dip-adds-rn-npdi,
title = {Troubleshooting calls that fail to ported numbers after cutover: source note post-port-routing-troubleshooting-rfc4694-dip-adds-rn-npdi},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/post-port-routing-troubleshooting-rfc4694-dip-adds-rn-npdi},
note = {Source note post-port-routing-troubleshooting-rfc4694-dip-adds-rn-npdi, checked 2026-10-02}
}