Hey all,
Seeing some weirdness on trunk US-East-01 - intermittent 401 Unauthorized responses during registration attempts. It’s not a full outage, calls eventually get through, but the dialer’s choking a bit - about 3% drop rate when it hits.
The SIP options are configured as expected, credentials haven’t changed, and the carrier swears it’s not on their end. We’re on Genesys Cloud v8.5.30.13. It’s almost like the initial registration’s timing out before the auth can complete. A quick workaround’s been to bump the registration interval on the trunk to 300 seconds - seems to hold for now. Anyone else running into this?
Right, 401s on BYOC - classic. Honestly, intermittent auth failures are usually a timing issue, tbh. The registration attempts are probably colliding with some internal GC process. We’ve seen this a lot with the v8.5.x releases - they’re… rough.
Check your registrationInterval and expiryInterval settings on the trunk configuration. I’m betting your registrationInterval is set too aggressively - like, under 60 seconds. Try bumping it to 120, maybe even 180. The expiryInterval should be at least 3x the registrationInterval, obviously.
Also, look at the retryCount and retryInterval values. If those are set too low, it’ll just keep hammering the registration endpoint with failing requests. A retryCount of 3 and a retryInterval of 30 is usually a good starting point, imo.
Double-check the SIP profile too - the authenticationCredentials need to match exactly what the carrier’s sending. iirc, case sensitivity can be a pain.
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Okay, yeah. Been there. Three coffees into debugging that exact issue back in '21 - felt like I was chasing ghosts, honestly. We were migrating a Twilio trunk - similar deal, intermittent 401s on registration, carrier blaming us, the whole song and dance.
The suggestion above about registrationInterval is a solid starting point, but it’s not just that. It’s the interplay between that and expiryInterval, and teh way Genesys Cloud handles re-registrations. We found that if your expiryInterval is too short, and registrationInterval is aggressive, you end up in a race condition. GC drops the registration before the carrier even acknowledges it, and the dialer gets grumpy.
Try this - registrationInterval at 120 seconds, expiryInterval at 300. Then, and this is important, go into the trunk settings and manually trigger a re-registration. See if the 401s stop for a while. If it’s still happening, you might be looking at something more obscure - a DNS issue maybe. But that interval tweak usually fixes it.
Also, and I only figured this out after a week of pain, make sure your SIP options are configured exactly as your carrier expects, especially the ‘Contact’ field. A tiny typo there will cause authentication to fail silently. It’s a pain to check, but it’s worth it.
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The registrationInterval/expiryInterval dance is… problematic. It’s not just about bumping those values up-it’s about understanding how Genesys Cloud’s SIP stack expects the re-registration to behave. The 401s happen when the stack hasn’t fully processed the initial registration before the trunk tries to re-register. It’s a race condition, basically. This has been a persistent annoyance with BYOC.
Try this config-it’s been pretty stable for us. Set registrationInterval to 120, and expiryInterval to 3600. The longer expiry gives the stack headroom to handle the initial registration properly, and the 120-second interval buys time for processing. The default values are just too aggressive. It’s been observed that the internal components struggle to keep pace!! It’s worth a redeploy after the change to ensure it’s fully applied.
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ok yeah, the REGISTRATION_INTERVAL/EXPIRY_INTERVAL thing is… something. honestly, the API design on those things feels like it was written by someone who’s never actually used SIP. like, why are they even exposed if GC is gonna fight you over them?
anyway, The earlier reply is right - it’s not just bumping those up. It’s the whole re-registration dance. I usually just ignore the SIP stack entirely and try to fix it in Architect Flows, which, let’s be real, is where things should be handled anyway.
but since you’re stuck wrestling with the trunk config itself, try this:
{
"registrationInterval": 180,
"expiryInterval": 3600,
"retryInterval": 60
}
I know, I know - 180 seconds seems long, but trust me. The GC SIP stack needs that much breathing room before it decides to throw a 401 just because it’s bored. And don’t even think about setting the RETRY_INTERVAL to anything under 60. That’s just asking for trouble.
Also - and this is important - double-check that your SIP profile’s AUTHENTICATION_TYPE is set to BASIC, and that your credentials in the TRUNK_BASE_SETTINGS are correct. I swear, half my day is spent chasing typos. It’s always the simple stuff.