dtmf issues

  ------------------------------------------------------------------------
2018-12-05 17:47:30.821791 [DEBUG] switch_rtp.c:7534 RTP RECV DTMF 2:800
2018-12-05 17:47:30.821791 [INFO] switch_channel.c:515 RECV DTMF 2:800
send 690 bytes to udp/[172.29.28.250]:5060 at 17:47:30.831474:
   ------------------------------------------------------------------------
   INFO sip:8118123295050@172.29.28.250:5060 SIP/2.0
   Via: SIP/2.0/UDP 172.29.29.139;rport;branch=z9hG4bKyDjDv8m331S2Q
   Max-Forwards: 70
   From: "4952761657" <sip:4952761657@172.29.29.139>;tag=D2p6vK738UB9Q
   To: <sip:8118123295050@172.29.28.250>;tag=i67p0D1301D0
   Call-ID: 80fc361c-733f-1237-a08b-acf1df3ff4f0
   CSeq: 131674556 INFO
   Contact: <sip:gw+c231bb3f-ec7e-4c49-9448-2d12500fe0a1@172.29.29.139:5060;transport=udp;gw=c231bb3f-ec7e-4c49-9448-2d12500fe0a1>
   User-Agent: FreeSWITCH
   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY
   Supported: timer, path, replaces
   Content-Type: application/dtmf-relay
   Content-Length: 24

   Signal=2
   Duration=100
   ------------------------------------------------------------------------
recv 461 bytes from udp/[172.29.28.250]:5060 at 17:47:30.839727:
   ------------------------------------------------------------------------
   SIP/2.0 200 OK
   Via: SIP/2.0/UDP 172.29.29.139;branch=z9hG4bKyDjDv8m331S2Q;received=172.29.29.139;rport=5060
   From: "4952761657" <sip:4952761657@172.29.29.139>;tag=D2p6vK738UB9Q
   To: <sip:8118123295050@172.29.28.250>;tag=i67p0D1301D0
   Call-ID: 80fc361c-733f-1237-a08b-acf1df3ff4f0
   CSeq: 131674556 INFO
   Contact: <sip:8118123295050@172.29.28.250:5060>
   Accept: multipart/mixed, application/sdp
   User-Agent: smg_pa_sip smg_pa_sip-3.10.1.20
   Content-Length: 0

   ------------------------------------------------------------------------