Source note · Calls that drop after about 30 seconds
The first diagnostic step for a suspected missing ACK is a SIP capture showing whether the ACK actually reaches the callee device. Then check that the Contact in the 200 OK carries an address the caller side can reach.
field report · Checked 2026-09-25
- Vendor
- OpenSIPS
- Product
- SIP (general)
- Subsystem
- troubleshooting
- Deployment
- any
- Region
- not restricted
- Release range
- as of 2017
- Status
- field report
- Checked
- 2026-09-25
Sources
- Troubleshooting missing ACK in SIP — OpenSIPS Project · tier 4 archived vendor documentation · Diagnostic approach section
Cite this note
APA
WarmTransfer. (2026, September 25). Calls that drop after about 30 seconds: source note sip-calls-drop-30-seconds-first-check-ack-arrives. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-calls-drop-30-seconds-first-check-ack-arrives
BibTeX
@misc{warmtransfer-claim-sip-calls-drop-30-seconds-first-check-ack-arrives,
title = {Calls that drop after about 30 seconds: source note sip-calls-drop-30-seconds-first-check-ack-arrives},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-calls-drop-30-seconds-first-check-ack-arrives},
note = {Source note sip-calls-drop-30-seconds-first-check-ack-arrives, checked 2026-09-25}
}