Source note · SIP registration failures
For Webex Calling behind NAT or PAT, Cisco says to size the NAT pool, make sure the NAT device can translate overlapping source ports to unique ports, and avoid strict source-port preservation.
Checked 2026-09-25
- Vendor
- Cisco
- Product
- Webex Calling
- Subsystem
- network
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-25
- Checked
- 2026-09-25
Sources
- Port Reference Information for Webex Calling — Cisco Systems, Inc. (help.webex.com) · tier 2 current vendor documentation · section 'Network Address Translation (NAT)'
Cite this note
APA
WarmTransfer. (2026, September 25). SIP registration failures: source note sip-registration-failures-wxc-nat-port-overlap. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-registration-failures-wxc-nat-port-overlap
BibTeX
@misc{warmtransfer-claim-sip-registration-failures-wxc-nat-port-overlap,
title = {SIP registration failures: source note sip-registration-failures-wxc-nat-port-overlap},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-registration-failures-wxc-nat-port-overlap},
note = {Source note sip-registration-failures-wxc-nat-port-overlap, checked 2026-09-25}
}