SIP Trunk 408 Timeout on Multi-Org Provisioning

Having some config trouble here… Encountering 408 Request Timeout errors when executing PUT /api/v2/telephony/sip/lines for a new trunk across three linked orgs. The integration is a Premium AppFoundry solution handling high-volume provisioning. Latency spikes suggest the Platform API is throttling concurrent writes despite valid OAuth scopes. Is there a specific rate limit adjustment required for bulk SIP trunk updates in a multi-org context?