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Cisco Unified
Communications Manager
SIP Trunking
Network Operations
Bill Efthimiou
APAN33 SIP workshop
February 2012
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Agenda
• Basic CUCM setup
• Partitions
• Calling Search Spaces
• Number Manipulation
• SIP trunking
• Early offer vs Delayed offer
• Demo call via workshop SIP server.
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Basic CUCM Setup – Activate required services
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Basic CUCM Setup – Cisco Unified CM
Auto Registration
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Basic CUCM Setup – Cisco Unified CM Group
•Redundancy
•primary vs
secondary
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Basic CUCM Setup – Phone NTP References
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Basic CUCM Setup – Date/Time Groups
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Basic CUCM Setup – Locations (Call Admission Control)
Use locations to implement
call admission control in a
centralized call-processing
system. Call admission
control enables you to
regulate audio quality and
video availability by limiting
the amount of bandwidth that
is available for audio and
video calls over links
between the locations.
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Basic CUCM Setup – Device Pool
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Basic CUCM Setup – Enable CDR
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Basic CUCM Setup – Media Resource Group
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Basic CUCM Setup – Media Resource Group List
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CUCM Partitions
The dial plan entries that you may place in a partition include IP
phone directory numbers, translation patterns, route patterns, CTI
route points, and voicemail ports. If two or more dial plan entries
(directory numbers, route patterns, or so forth) overlap, Unified CM
selects the entry with the closest match (most specific match) to the
dialed number. In cases where two dial plan entries match the dialed
pattern equally, Unified CM selects the dial plan entry that appears
first in the calling search space of the device making the call.
Source: Cisco Unified Communications System 8.x SRND
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CUCM Calling Search Spaces
A calling search space defines which partitions are accessible to a
particular device. Devices that are assigned a certain calling search
space can access only the partitions listed in that calling search space.
Attempts to dial a DN in a partition outside that calling search space
will fail, and the caller will hear a busy signal. If you configure a
calling search space both on an IP phone line and on the device (phone)
itself, Unified CM concatenates the two calling search spaces and
places the line's calling search space in front of the device's calling
search space.
Source: Cisco Unified Communications System 8.x SRND
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CUCM – Partition Order
Source: Cisco Unified Communications System 8.x SRND
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CUCM – Concatenation of Line and Device CSS
Source: Cisco Unified Communications System 8.x SRND
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Number Manipulation – Route Pattern
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Number Manipulation – Translation Pattern
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Number Manipulation – Route List Detail
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SIP Trunking – CUCM 8.5
SIP trunks provide connectivity to other SIP devices such as gateways, SIP proxies,
applications, and other Unified CM clusters. Today, SIP is arguably the most commonly
chosen protocol when connecting to service providers and Unified Communications
applications. Cisco Unified CM 8.5 and later releases provide the following SIP trunk
and call routing enhancements:
• Can run on all Unified CM nodes
• Up to 16 destination IP addresses per trunk
• SIP OPTIONS ping keepalives
• SIP Early Offer support for voice and video calls (insert MTP if needed)
• QSIG over SIP
• SIP trunk normalization and transparency
• Supports the use of route lists on all Unified CM nodes
The SIP trunk features available in the current release of Unified CM make SIP the
preferred choice for new and existing trunk connections.
Source: Cisco Unified Communications System 8.x SRND
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SIP Trunk Configuration – 8.0
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SIP Trunk Configuration – 8.0 (continued)
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SIP Trunk Security Profile
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Delayed offer vs Early offer
• Delayed offer = NO SDP in original SIP INVITE
• Early offer = SDP included as part of original SIP INVITE
• With delayed offer, caller makes the final codec decision.
• With early offer, called makes the final codec decision.
• Prior to CUCM version 8.5, SIP trunk only supported delayed offer.
• AARNet’s experience with delayed offer was, issues when calling MCUs.
MCU’s support many codec’s. Therefore, the responding SIP/SDP body,
is very large and causes massive fragmentation issues. Signaling or
negotiation would often fail.
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Delayed offer- trace
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Early offer- trace
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CUCM Early Offer enabled
Copy “Standard SIP Profile”
Standard SIP Profile  Standard SIP Profile- w early offer.
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CUCM Early Offer enabled
<snip>
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Thank you
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Questions
?