MGCP Gateway Integration with CUCM and PSTN Service Provider
https://supportforums.cisco.com/docs/DOC-22421
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Cisco Unified Mobility: Single Number Reach & Call flows
https://supportforums.cisco.com/docs/DOC-23053
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Configuring Call Manager Voice Gtewayes
http://jeffreycmiller.com/download/3814551-Configuring-CallManager-Voice-Gateways.pdf
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http://www.ciscopress.com/articles/article.asp?p=2021962&seqNum=7
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Managing the Phone System Integrations
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Unity Connection
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Media Termination point (MTP)
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Configuring ISDN PRI