Intermittently not receiving 200 OK SDP from Livekit

Jaivarsan B
Wed, 25 Mar 2026 15:23:53 +0000
Telephony

Hi team,

We’re seeing an intermittent issue where 200 OK responses for SIP INVITEs sent to our trunk (20bb9gxx1qz.in.sip.livekit.cloud:5060) are not reaching our public IP (13.205.190.16:5060).

We’ve isolated two calls that reproduce the issue:

• SCL_Zgnz65HQ9EoR (SIP Call-ID: a93d4b6aa724481f0b1ebc03aeaffa08)
→ 200 OK was sent from 143.223.91.141:5060 — we did NOT receive it

• SCL_oJFy5m8UMb7a (SIP Call-ID: db86dc172330f50d76357e3772a2ad56)
→ 200 OK was sent from 143.223.91.157:5060 — we received it fine

Scale of the issue: roughly 10 out of every 250 calls fail this way, so it’s intermittent but consistent enough to be impactful.

We’ve ruled out UDP packet drops on our end — no drops observed in our captures.

Could you help us with:
Can you confirm whether 143.223.91.141 successfully dispatched the 200 OK for SCL_Zgnz65HQ9EoR toward 13.205.190.16:5060? If possible please share the trace / log.

We have pcap files for both calls (SCL_Zgnz65HQ9EoR_3c5728481126b957b51da37a5d707457.pcap and SCL_oJFy5m8UMb7a_db86dc172330f50d76357e3772a2ad56.pcap) and can share them if helpful.

Thanks

Link to our pcap (7MB): https://drive.google.com/file/d/1PhoIwM_vBAq4o_X2IIgh--wnGjrn-BQE/view?usp=sharing (there is 5MB file limit on this UI)

SCL_Zgnz65HQ9EoR_3c5728481126b957b51da37a5d707457.pcap (94.9 KB)

SCL_oJFy5m8UMb7a_db86dc172330f50d76357e3772a2ad56.pcap (270.5 KB)

2 posts - 2 participants