Hold 전화 끊김 midcall-signaling block

상담원 연결 Hold 걸었을경우 전화가 끊어지는 현상 

중간 SIP signaling을 막아주는거 같은데 

해당 옵션을 쓸일이 있을지.. 

voice service voip

  sip

    midcall-signaling block

    early-offer forced

 

originally i had it as 

voice service voip

  sip

    midcall-signaling pass-through

     early-offer forced

https://supportforums.cisco.com/t5/video-over-ip/sip-trunk-call-hold-fails-no-audio-no-resume-no-sdp-from-cube/td-p/2214595