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ENUM alternatives

Until ENUM (or a similar standard) is widely adopted by serv-

ice providers, enterprises using SIP can leverage existing solu-

tions such as LDAP (Lightweight Directory Access Protocol)

to store both a user’s URI and all associated phone numbers

(E.164 addresses). SIP applications can then reference entries

stored in LDAP structures to resolve and translate phone

numbers to URIs.

Vendors are already expressing support for LDAP intercon-

nectivity. For example, with a simple plug-in, Avaya’s SIP

Enablement Services platform can interface with LDAP to

send calls bound for SIP URIs to standard telephones on the

enterprise’s IP PBX.

Part 4: How SIP Transforms Enterprise Communications

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SIP guide

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 73 74

Communications 1
Publisher’s Acknowledgments 4
Contents at a Glance 5
Foreword 6
About This Book 9
Foolish Assumptions 9
How This Book Is Organized 9
Introduction 10
Icons Used in This Book 11
Where to Go from Here 11
The Case for SIP 12
What Is SIP? 13
Presenting Presence Services 14
Celebrating User-Centric 14
SIP guide 15
Encouraging Interoperability 16
Simplifying Communications 17
Architecture 17
Part 1: The Case for SIP 18
SIP at a Glance 20
Based on Existing Internet 21
Standards 21
Getting Down to One Address 21
SIP “business cards” 22
A SIMPLE Presence Solution 24
Components in a SIP Network 24
Using user agents 25
Serving up SIP servers 26
Basic SIP Operations 28
How SIP Transforms User 30
Using Presence to Route 32
One Protocol, Many Modes of 34
Communication 34
Making the Most of 36
User Preference 36
Catering to the Mobile 37
User with SIP 37
How SIP Transforms 40
Enterprise Communications 40
Working Together: SIP and 41
Trunking with SIP 41
Traditional network model 42
A simplified communications 44
Connecting SIP Enterprises 45
Mapping Phone Numbers 47
ENUM alternatives 48
SIP Interoperability 50
External from the Enterprise 51
SIP Interoperability Efforts 51
Part 5: SIP Interoperability 52
Multi-Vendor Integration 53
SIP and Server-Free 56
Peer-to-Peer SIP 57
Communications Overview 57
Reaping the Benefits 59
SIP and the Future of 62
Intelligent Communications 62
Integration with Business 63
Applications 63
Seamless Use of Multiple 64
Presence-PBX Integration 64
Further Optimization 65
Communication Systems 65
That Learn 65
Location-Based Services 66
Ensuring Privacy 66
The Internet Multimedia 67
Subsystem 67
Top Ten Reasons for SIP 68
Enhanced Communications 68
Preference-Based 69
An Open Standard 69
Interoperability 69
Unified Addressing 70
Operational Cost Savings 70
Simplified Communications 70
Creation of New Services 71
Native Mobility 71
Ease of Implementation and 71
INTERNET & DIGITAL MEDIA 72
CS For Dummies 73
CS Timesaving 73

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Avia Tablet Accessory Avaya Custom Edition Manuale Utente Pagina 48

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