User's Manual
404
Document #: LTRT-89729
Mediant 3000
Routing:
•
IP-to-IP routing translations of SIP, UDP, TCP, TLS (when extensive transcoding
is not required).
•
Load balancing and redundancy of SIP servers.
•
Routing according to Request-URI\Specific IP address\Proxy\FQDN.
•
Alternative routing.
•
Routing between different Layer-3 networks (e.g., LAN and WAN).
Load balancing\redundancy of SIP servers.
ITSP accounts.
SIP URI user and host name manipulations.
Coder transcoding.
28.1 SIP Network Definitions
The device's SBC application can implement multiple SIP signaling and RTP (media)
interfaces.
28.2 SIP Dialog Initiation Process
The device's SIP dialog initiation process concerns all incoming SIP dialog initiation
requests. This includes SIP methods such as INVITE, SUBSCRIBE, OPTIONS, REFER,
INFO, UNSOLICITED NOTIFY, MESSAGE, and REGISTER.
The SIP dialog initiation process consists of the following stages:
1.
Determining source and destination URL:
The SIP protocol has more than one
URL in a dialog-establishing request that may represent the source and destination
URLs. When handling an incoming request, the device uses specific SIP headers for
obtaining the source and destination URLs. Once these URLs are determined, their
user and host parts are used as input for the classification process, message
manipulation, and call routing.
•
All SIP requests (e.g., INVITE) except REGISTER dialogs:
♦
Source URL: The source URL is obtained from the SIP header according to
the following logic:
The source URL is obtained from the From header.
If the From header contains the value 'Anonymous', the source URL is
obtained from the P-Preferred-Identity header.
If the P-Preferred-Identity header does not exist, the source URL is
obtained from the P-Asserted-Identity header.
♦
Destination URL: The destination URL is obtained from the Request-URI.
•
REGISTER dialogs:
♦
Source URL: The source URL is obtained from the To header.
♦
Destination URL: The destination URL is obtained from the Request-URI.
Note:
You can determine the SIP header from where the device obtains the source
URL in the incoming SIP request. This is done in the IP Group table using the
'Source URI Input' parameter.
Summary of Contents for Mediant 3000
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Page 27: ...Part I Getting Started with Initial Connectivity...
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Page 41: ...Part II Management Tools...
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Page 103: ...Part III General System Settings...
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Page 113: ...Part IV General VoIP Configuration...
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Page 399: ...Part VI Session Border Controller Application...
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Page 465: ...Part VII Stand Alone Survivability Application...
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Page 497: ...Part VIII IP Media Capabilities...
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Page 501: ...Part IX High Availability System...
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Page 515: ...Part X Maintenance...
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Page 565: ...Part XI Status Performance Monitoring and Reporting...
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Page 609: ...Part XII Diagnostics...
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Page 639: ...Part XIII Appendix...
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