Cisco Expressway Administrator Guide (X15.4) - Dial Plan and Call Processing

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/admin_guide/X15-4/exwy_b_cisco-expressway-administrator-guide-x154/exwy_m_dial-plan-and-call-processing.html

Published

2026-02-09

Updated

unknown

Accessed

2026-09-25

HTTP status

200

License

Cisco website terms of use; all rights reserved; no-redistribution; short excerpts and locators only

Source notes citing this source

• Cisco advises avoiding the Any wildcard for a search rule's Source to minimise toll-fraud risk. in context
• Expressway Call Policy mode can be Off, Local CPL (web-configured rules or an uploaded CPL script, mutually exclusive) or Policy service (an external service decides). in context
• The Expressway uses _h323ls._udp SRV records for H.323 location services and _h323cs._tcp SRV records for H.323 call signalling. in context
• Expressway hop count ranges from 1 to 255 with a default of 15, decreasing by one each time a request is forwarded; for URI or ENUM dialling the hop count of the DNS or ENUM zone is used. in context
• For external systems to reach a domain by URI dialing, the domain must publish the appropriate DNS SRV and A/AAAA records. in context
• If Local CPL is enabled but no policy is configured or uploaded, a default policy is applied that allows all calls. in context
• A search rule's Request must be authenticated option restricts the rule to requests from authenticated devices. in context
• The Expressway processes a call by applying pre-search transforms, then Call Policy, then User Policy (FindMe), then search rules, and restarts the process whenever a new alias results. in context
• Search rule priorities range from 1 to 2000, with lower numbers taking higher priority, and every applicable target is queried when several rules match at the same priority. in context
• A search rule's Source can be Any (including unregistered devices and the public internet), All zones (local zone and configured zones only), Local Zone (registered devices only) or Named. in context
• On successful match, Stop halts processing of lower-priority search rules, but other rules at the same priority are still applied. in context
• The Expressway supports up to 100 pre-search transforms with unique priorities from 1 to 65534, and only one transform can match per search. in context
• For URI dialing, the Expressway queries NAPTR records first, then SRV records, then A or AAAA records. in context

Cite this source record

APA

WarmTransfer. (2026, February 9). Cisco Expressway Administrator Guide (X15.4) - Dial Plan and Call Processing. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-exwy-admin-x154-dial-plan

BibTeX

@misc{warmtransfer-cisco-exwy-admin-x154-dial-plan,
  title  = {Cisco Expressway Administrator Guide (X15.4) - Dial Plan and Call Processing},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-exwy-admin-x154-dial-plan},
  note   = {Cisco Systems, accessed 2026-09-25}
}