Cisco IP Phone 6851 User Manual

Dual Registration 40
Dual Registration and DNS SRV Limitations 40
Dual Registration and Alternate Proxy 41
Failover and Recovery Registration 41
Fallback Behavior 41
RFC3311 41
SIP NOTIFY XML-Service 41
SIP Configuration 42
Configure the Basic SIP Parameters 42
Configure the SIP Timer Values 42
Configure the Response Status Code Handling 42
Configure the RTP Parameters 43
Configure the SDP Payload Types 43
Configure the SIP Settings for Extensions 44
Configure the SIP Proxy Server 44
Configure the Subscriber Information Parameters 44
Managing NAT Transversal with Phones 44
Enable NAT Mapping 45
NAT Mapping with Session Border Controller 45
NAT Mapping with SIP-ALG Router 45
NAT Mapping with the Static IP Address 45
Configure NAT mapping with STUN 46
Determining Symmetric or Asymmetric NAT 47
Dial Plan 48
Dial Plan Overview 48
Digit Sequences 48
Digit Sequence Examples 49
Acceptance and Transmission of the Dialed Digits 51
Dial Plan Timer (Off-Hook Timer) 52
Syntax for the Dial Plan Timer 52
Examples for the Dial Plan Timer 52
Interdigit Long Timer (Incomplete Entry Timer) 52
Syntax for the Interdigit Long Timer 52
Example for the Interdigit Long Timer 53
Interdigit Short Timer (Complete Entry Timer) 53
Cisco IP Phone 6800 Series Multiplatform Phones Administration Guide
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Contents

Cisco IP Phone 6851 Specifications

General

Brand	Cisco
Model	IP Phone 6851
Category	IP Phone
Language	English