Cisco SIP IP Phones
Cisco SIP IP Phones:
Type A SIP Phones: Cisco Unified IP Phone models 7905, 7912, 7940 and 7960
Type A SIP Phones retain SIP dial rules, which are configured in CUCM and downloaded to the IP Phone at boot era. It does not preserve KPML. SIP dial rules will enable dial mood and acclaimed phone functionality more or less CUCM.
Type A SIP Phones: No Dial rules
Type A Cisco IP Phones using SIP firmware without SIP dial rules attain not take in hand a dial sky to the calling party gone the calling party goes off-hook as soon as the handset or speaker phone. All digits are sent to CUCM enbloc after the fanatic completes the dialing and press the Dial softkey.
Figure shows, User making a call to extension 1000. The devotee dials 1000 followed by pressing the Dial soft key. The Cisco IP Phone sends a SIP INVITE publication to CUCM along afterward each and every one portion of share of dialed digits (enbloc). CUCM performs digit analysis and provides a call innovation pronouncement to the IP Phone.
Type A SIP Phones: Dial rules
SIP dial rules pay for admission SIP Phones to emulate the functionality of an SCCP Phone behind dial express and digit-by-digit pattern analysis. When SIP dial rules are leveraged, a devotee receives dial look as soon as than going off-hook. This functionality is exchange than the default functionality upon Cisco Type A phones converted to SIP, where there are no local dial rules.
Dialed digits are processed neighboring to the local SIP dial rules in definite times. If a enthusiast dials a phone number that is rejected by the local SIP dial rules, for example pay dialing initiation behind 9-1900 the call is dropped without being forwarded to CUCM. SIP dial rules can statement minimized overhead bandwidth consumption and CUCM processor overhead.
A SIP INVITE statement considering enbloc signaling is sent from the Cisco SIP IP Phone to CUCM when the SIP dial believe to be of the Cisco IP Phone recognizes and permits the dialed pattern. End user do not dependence to press the Dial key behind they had to upon Cisco SIP type A phones. SIP dial rules make available Type A Phones to emulate SCCP and acclaimed phone systems even though with providing approach and signaling overhead bolster.
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