Hi Yes, You're right. Actually my problem solved by setting rtp-nte under dial peer configuration and also changing DTMF mode in SIP Trunk configuration in CUCM from RFC2833 to No preference. Thank You
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Have you checked you SIP Min-SE Value in UCM? Default value is 1800, the invite has 90 which could explain the 422 Session Timer too small. This post might be helpful: https://community.cisco.com/t5/ip-telephony-and-phones/cucm-timer-problem-422-session-timer-too-small/td-p/1884527
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