- If the organization does not run CUCM/IM&P or is migrating away from those platforms: Expressway’s primary advantages are reduced; consider SBC or cloud-native patterns instead.
- If the primary need is Microsoft Teams telephony interconnect / Direct Routing: an SBC-focused solution may be more appropriate.
- If the organization cannot maintain certificate lifecycle processes, DNS hygiene, and DMZ operations: Expressway deployments are sensitive to certificate trust, DNS, and firewall/NAT details, and misconfigurations are common causes of failures.
- If transparent, self-serve pricing is required: Expressway pricing is largely quote-based and licensing can be complex.
- If the organization requires product-specific, publicly documented security certifications for Expressway itself: such attestations were not readily identified in the sources reviewed.