Missing documentation for new environment variables. The new TRUNK_SLOTS, TRUNK_PORT_START, BEHIND_NAT, and PRIVATE_IP environment variables are used in the bootstrap script but are not documented in the README.md file. These should be added to the Environment variables section to help users understand how to configure multi-trunk support.

Potential port conflict risk. The TLS port calculation $((SLOT_PORT + 1000)) could lead to port conflicts if TRUNK_SLOTS is large enough. For example, with TRUNK_PORT_START=5071 and TRUNK_SLOTS=30, the last UDP/TCP slot would be on port 5100, while the first TLS slot is on 6071. However, if users configure a large number of slots or a high starting port, there's no validation to prevent overlap. Consider adding validation or documenting the maximum safe value for TRUNK_SLOTS given the port offset.

Missing input validation for TRUNK_SLOTS. The script checks if TRUNK_SLOTS is set and greater than 0, but doesn't validate that it's a valid integer. If a non-numeric value is provided, the comparison -gt 0 will fail with an error. Consider adding validation like [[ "${TRUNK_SLOTS}" =~ ^[0-9]+$ ]] before the numeric comparison.

Missing input validation for X-ProxySlot header value. The header value is directly assigned to $fsn (forced send socket name) without validating that it corresponds to an actual configured slot name (e.g., "slot1", "slot2"). An attacker could send arbitrary values in this header, potentially causing routing errors or unexpected behavior. Consider validating that the header value matches the expected pattern (e.g., slot[1-9][0-9]*) and corresponds to a configured slot.

Same slot name assigned to different protocols and ports. All three protocols (UDP, TCP, TLS) for a given slot use the same name (e.g., "slot1"), but bind to different ports. While this might be intentional for logical grouping, it could cause confusion when trying to select a specific protocol+port combination via $fsn. Kamailio's forced send socket selection using the same name for multiple listeners may lead to unexpected behavior. Consider using protocol-specific names (e.g., "slot1_udp", "slot1_tcp", "slot1_tls") or document the expected behavior when the same name is used across protocols.

Large block of commented-out code should be removed or properly documented. This commented implementation references a hash table lookup approach ($sht(trunkslots=>$var(lookup_key))) that appears to be an alternative to the current X-ProxySlot header approach. If this code represents a planned future enhancement, it should be documented in a comment explaining why it's preserved. Otherwise, it should be removed to improve maintainability.

The htable module's db_url parameter is added but no corresponding hash table for trunk slots is configured. The commented code at lines 1118-1129 references $sht(trunkslots=>$var(lookup_key)), but there's no modparam("htable", "htable", "trunkslots=>...") configuration. If the db_url is intended for future use with the commented code, this should be documented. If it's not needed for the current X-ProxySlot header implementation, it should be removed.