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Hello,
it seems that v7x phones are incorrectly handling % sign in display name. After receiving such INVITE message phone is replying with non-parseable message - no closing quote after display name.
My suspicion is that phones are incorrectly expecting escaped string in display name, see http://tools.ietf.org/html/rfc4475#section-3.1.1.5 for reference.

Hi tomoko，

V72 should have solved this issue. Can you check again?

Just checked T28 with 2.72.0.30 firmware and problem still exists.

I will submit this issue to our R&D.
In order to do more troubleshootings, please supply me syslog level 6, config.bin and pcap.
How to Get the Correct Syslog, Config.bin and Trace

Attached: log/config files.

Thanks to your files. I can find the problem in your pcap file.