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IP phones process register with DNS server and can be observed that there are 2 records type ( A and TXT)

Hello,

My customer has checked the DNS server after IP Phone registration in the network environment.

Everything is working fine.

For information my customer uses CUCM 7, UNITY 7, CUCIMOC 7 and OCS 2007 R2.

But he found that IP phones register with DNS server and can be observed that there are 2 recordings (A and TXT)

Example:

sep0022900512345      Host (A)                        10.200.34.44

sep0022900512345      Text (TXT)                      31bccaaa1234568643223fefb8…

I need some help to understand and explain this text registration in DNS server.

Which feature enable txt recording?

Please let me know.

Thanks

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