Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Forwarding

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c9779fc8_00_call-forwarding-12-0.html

Published

2026-09-16

Updated

unknown

Accessed

2026-09-24

HTTP status

200

License

Cisco copyright; all rights reserved; no-redistribution; short excerpts and locators only

Source notes citing this source

• In Unified CM, Call Forward All forwards all calls to a directory number. in context
• On Unified CM phones, the message showing that Call Forward All is active has higher display priority than the Do Not Disturb message. in context
• In Unified CM, Call Forward Busy (internal and external) forwards calls only when the line is in use and the configured Call Forward Busy trigger value is reached. in context
• In Unified CM, Call Forward No Answer forwards a call when the phone is not answered before the No Answer Ring Duration expires or when the destination is unregistered. in context
• In Unified CM, Call Forward No Coverage forwards calls when the hunt list is exhausted or timed out and the associated hunt pilot for coverage specifies Use Personal Preferences. in context
• In Unified CM, Call Forward Unregistered forwards calls when the phone is unregistered because of a remote WAN link failure and provides automated rerouting through the PSTN. in context
• The Unified CM service parameter Max Forward UnRegistered Hops to DN limits how many forward-unregistered hops are allowed for a directory number at the same time, to prevent forwarding loops. in context
• The Unified CM Forward Maximum Hop Count service parameter sets the maximum number of times a single call can be forwarded or diverted. in context
• Unified CM hunt pilots can set Forward Hunt No Answer and Forward Hunt Busy destinations, which are used when the hunt list is exhausted or the hunt timer expires. in context
• In Unified CM, leaving a line's No Answer Ring Duration empty makes the line use the Cisco Unified Communications Manager Forward No Answer Timer service parameter instead. in context
• Cisco instructs that the Unified CM no-answer ring duration be set lower than the T301 Timer service parameter. in context
• When the Voice Mail check box is checked for a Unified CM forward type, Unified CM ignores the Destination and Calling Search Space fields for that forward type. in context
• Call Forward No Coverage forwards calls when the hunt list is exhausted or timed out and the hunt pilot used for coverage specifies Use Personal Preferences for its final forwarding; it has Internal and External variants. in context
• Forward Hunt No Answer and Forward Hunt Busy each offer Do Not Forward Unanswered Calls, Use Forward Settings of Line Group Member, or Forward Unanswered Calls to a destination with a calling search space. in context
• When Unified CM hunts to a line group member, it ignores that member's Call Forward No Answer, Call Forward Busy and Call Forward All settings. in context
• When a hunt party fails to answer or is busy, hunting resumes with the next hunt party, and after the hunt list is exhausted or times out the call follows the hunt pilot's hunt call treatment settings. in context
• The Maximum Hunt Timer is canceled if a hunt member answers or the hunt list is exhausted before it expires. in context
• Cisco describes the Maximum Hunt Timer as the maximum time for hunting without queuing. in context
• The Maximum Hunt Timer on a Unified CM hunt pilot accepts 1 to 3600 seconds with a default of 1800 seconds. in context
• Enabling queuing on a hunt pilot automatically disables its Forward Hunt No Answer and Forward Hunt Busy settings. in context
• Unified CM does not prevent a CFA loop when Call Forward All is activated through Unified CM Administration or the Self Care Portal instead of from the phone. in context
• Unified CM supports CFA loop breakout, so an existing CFA loop does not break call processing: the call runs through the forwarding chain and breaks out of the loop. in context
• With CFA Destination Override enabled, Unified CM ignores the CFA destination when it matches the calling party number, so the forwarding target calling the initiator rings the initiator instead of forwarding back. in context
• Unified CM prevents Call Forward All activation from the phone when the new destination would complete a CFA loop, for example 1000 forwarding to 1001 when 1001, 1002 and 1003 already forward all calls in a chain back to 1000. in context
• Unified CM's hop-count-based CFA activation block applies only when CFA is activated from the phone, the chain exceeds Forward Maximum Hop Count, and every phone in the chain uses CFA rather than CFB, CFNA or another forwarding type. in context
• In Unified CM 15, the Forward Maximum Hop Count service parameter (System > Service Parameters) sets the maximum number of times a single call can be forwarded or diverted. in context
• When a call in Unified CM 15 reaches the forwarding maximum hop count, it goes to the original called party's MAP target if one is configured; otherwise it is rejected and the caller hears reorder tone. in context
• For incoming QSIG calls, Unified CM caps diversions at 15 regardless of a higher Forward Maximum Hop Count, and Cisco recommends setting the parameter to 15 when QSIG trunks are configured. in context
• Unified CM has a separate service parameter, Max Forward UnRegistered Hops to DN, that sets how many forward-unregistered hops a directory number may have at the same time. in context

Cite this source record

APA

WarmTransfer. (2026, September 16). Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Forwarding. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-cucm-featconfig-15-call-forwarding

BibTeX

@misc{warmtransfer-cisco-cucm-featconfig-15-call-forwarding,
  title  = {Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Forwarding},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-cucm-featconfig-15-call-forwarding},
  note   = {Cisco Systems, accessed 2026-09-24}
}