DTMF doesn't work for outbound call

We currently using UC520 and having strange problem. When we call through SIP for outbound call DTMF tone is not transmitting. and if I press multiple numbers with longer duration, It makes continuous tone on the other hand.
My current dialpeer uses DTMF relay RTP- NTE. I will attach sh run and debug ccsip message file. please help me this is being quite critical.

Seems like your SIP Trunk Service provider is not getting the RFC2833 packets or not interpreting them correctly.
I see on the log that you pressed 1, 2 & 3 and the UC520 sends all these digits out (each digit will have 7 packets - this post explains how to read this debug - https://www.myciscocommunity.com/message/14045#14045). So I know its not the UC520 - below is a snip for digit 1
Sep 10 16:26:26.114:          s=DSP d=VoIP payload 0x65 ssrc 0x15FE9166 sequence 0x4B86 timestamp 0xBCB7190A
Sep 10 16:26:26.114:          Pt:101    Evt:1      Pkt:04 00 00 >>
Sep 10 16:26:26.114:          s=DSP d=VoIP payload 0x65 ssrc 0x15FE9166 sequence 0x4B87 timestamp 0xBCB7190A
Sep 10 16:26:26.114:          Pt:101    Evt:1       Pkt:04 00 00 >>
Sep 10 16:26:26.114:          s=DSP d=VoIP payload 0x65 ssrc 0x15FE9166 sequence 0x4B88 timestamp 0xBCB7190A
Sep 10 16:26:26.114:          Pt:101    Evt:1       Pkt:04 00 00 >>
Sep 10 16:26:26.114:          s=DSP d=VoIP payload 0x65 ssrc 0x15FE9166 sequence 0x4B89 timestamp 0xBCB7190A
Sep 10 16:26:26.114:          Pt:101    Evt:1       Pkt:04 01 90 >>
Sep 10 16:26:26.114:          s=DSP d=VoIP payload 0x65 ssrc 0x15FE9166 sequence 0x4B8A timestamp 0xBCB7190A
Sep 10 16:26:26.114:          Pt:101    Evt:1       Pkt:84 03 20 >>
Sep 10 16:26:26.114:          s=DSP d=VoIP payload 0x65 ssrc 0x15FE9166 sequence 0x4B8B timestamp 0xBCB7190A
Sep 10 16:26:26.114:          Pt:101    Evt:1       Pkt:84 03 20 >>
Sep 10 16:26:26.114:          s=DSP d=VoIP payload 0x65 ssrc 0x15FE9166 sequence 0x4B8C timestamp 0xBCB7190A
Sep 10 16:26:26.114:          Pt:101    Evt:1       Pkt:84 03 20 >>
In terms of next steps:
- Is there any router or NAT or firewall device between the UC520 WAN interface and the SIP Trunk service provider? If so maybe good to check if you can bypass this device or if this device blocks RFC2833 packets
- Ask the SIP Trunk SP what they see on their end for the RFC2833 packets - you can send them a wireshark capture off the UC500 WAN port if that is more convincing than a debug log. Who is the SP by the way?

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