To use TCP for SIP signalling, perform the following steps:
Step One - SIP Settings
Enable TCP in SIP Settings:
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From the UCx Web-based Configuration Utility, navigate to PBX - PBX Configuration - SIP Settings page
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Scroll down to the Other SIP Settings option
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Enter the following value: tcpenable = yes
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Click on Submit Changes button
Step Two - Trunk
Add "transport=tcp" to the trunk configuration:
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From the UCx Web-based Configuration Utility, navigate to PBX - PBX Configuration - Trunks page
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Select the desired trunk
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In the PEER Details box, add transport=tcp
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Click on Submit Changes button
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Click on Apply Config bar