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Locating SIP Services
It is very convenient to be able to use one's personal address, i.e: john@company.com, for both email and SIP communications (IP telephony, presence, video conferencing etc), just by changing the application prefix. For example:

email:john@company.com and
sip:john@company.com

DNS is the mechanism for determing the IP address, port and transport of the host to which a SIP request is sent.

DNS provides two different record types that controls SIP requests: SRV and NAPTR. The SRV resource record allows DNS administrators to use several servers, located on differnet places, for a single domain. The NAPTR record is a way for the called domain to specify which protocol it prefers a SIP request to use.

   
More Information:
Learn how to set up SRV and NAPTR records (the SIP.edu Cookbook)
   
Tip!
Tekea is a company specialized in services to make SIP based live Internet communication useful and easy to use. Sign up for their DNS and ENUM services to get total control of you DNS management.




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