Source note · Calls that drop after about 30 seconds
In a 2009 3CX forum thread, incoming calls dropped at exactly 32 seconds and the logs said 'ACK is not received'. Removing a port-forwarding rule and correcting the public IP used in the Contact fixed most occurrences.
field report · Checked 2026-09-25
- Vendor
- 3CX
- Product
- 3CX Phone System
- Subsystem
- NAT / firewall
- Deployment
- on-premises
- Region
- not restricted
- Release range
- 2009-era releases
- Status
- field report
- Checked
- 2026-09-25
Sources
- Strange call disconnect after 32 seconds — 3CX Community forum · tier 6 community and field reports · Posts by kliker (2009-07-24) and MatsW (2009-08-27/28)
Cite this note
APA
WarmTransfer. (2026, September 25). Calls that drop after about 30 seconds: source note sip-calls-drop-30-seconds-3cx-32s-field-case. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-calls-drop-30-seconds-3cx-32s-field-case
BibTeX
@misc{warmtransfer-claim-sip-calls-drop-30-seconds-3cx-32s-field-case,
title = {Calls that drop after about 30 seconds: source note sip-calls-drop-30-seconds-3cx-32s-field-case},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-calls-drop-30-seconds-3cx-32s-field-case},
note = {Source note sip-calls-drop-30-seconds-3cx-32s-field-case, checked 2026-09-25}
}