Can anyone clarify the expected behavior of SIP registration keep-alives when switching between primary and secondary carriers on a BYOC trunk? We manage 15 BYOC trunks across APAC regions, and recently noticed that during peak traffic windows (around 1400 SGT), the failover logic triggers prematurely. The primary carrier (Singtel) shows stable throughput, but the SBC logs indicate intermittent SIP 408 Request Timeout errors for REGISTER requests just before the switch. This causes a brief service interruption as the secondary carrier (StarHub) takes over, even though the primary path is technically functional. The Genesys Docs mention a configurable health check interval, but it is unclear if the default 30-second window is too aggressive for carrier-specific latency spikes. We have verified that the SBC certificates are valid and the outbound routing rules are correctly prioritized. Is there a recommended jitter tolerance setting to prevent these false-positive failovers? We are seeing this pattern consistently on trunk IDs starting with TRK-SG-04.
it depends, but generally… the 408 timeout is often a symptom of the sbc dropping register requests during the handoff window rather than a carrier issue. when you manage multiple byoc trunks, the keep-alive interval needs to be significantly longer than the failover detection time. if the sbc sends a register request while the primary path is unstable, it times out before the secondary path is fully established.
for bulk export and chain of custody purposes, these gaps create metadata mismatches. the recording api might flag the interaction as “incomplete” if the sip dialog never properly closes before the failover triggers. to fix the registration jitter, adjust the sip registrar settings on your sbc. increase the expiration time for register requests to at least 60 seconds. this prevents the sbc from aggressively refreshing registrations during high load.
here is a sample config snippet for the sbc sip profile:
<sip-profile>
<registration>
<expiration>60</expiration>
<refresh-threshold>10</refresh-threshold>
<max-contacts>500</max-contacts>
</registration>
<keep-alive>
<interval>25</interval>
<method>options</method>
</keep-alive>
</sip-profile>
also, ensure your bulk export jobs are configured to handle partial media files. if a failover occurs during an active call, the initial segment might be incomplete. the json manifest in s3 will reflect a status: interrupted flag. your legal hold process should account for these segments to maintain chain of custody integrity. check the media_type flag in the interaction object to ensure digital channel recordings are not being incorrectly grouped with sip trunk failures. this separation helps in auditing the specific cause of the 408 errors without corrupting the broader recording dataset.