call_forwarding

Configurations is:

sip.conf

[372652136]
secret=xxxxxxxx
host=elion.ee
type=friend
qualify=4000
context=class1
insecure=invite

extension.conf

[to_tech]
exten => s,1,NoOp(Call comming from ${CALLERID(all)})
exten => s,n,Dial(SIP/372652136/5162246,20,Tt)
exten => s,n(noanswer),Playback(/var/spool/asterisk/tmp/koik_hoivatud)
exten => s,n,Voicemail(tech@class1,s)

All calls is comming in, and can joice menu options (press NR1 or press NR2).

But if Asterisk forwarding the call, the comming follow issue and coing to the voicemail:

-- Executing [s@to_tech:9] Answer("SIP/372652136-00000055", "") in new stack
    -- Executing [s@to_tech:10] Dial("SIP/372652136-00000055", "SIP/372652136/5162246,20,Tt") in new stack
  == Using SIP RTP TOS bits 184
  == Using SIP RTP CoS mark 5
    -- Called SIP/372652136/5162246
[Mar 30 11:46:21] WARNING[14184]: chan_sip.c:20245 handle_response_invite: Received response: "Forbidden" from '"+37255646772" <sip:++37255646772@xxx.xxx.xxx.xxx>;tag=as319ffa31'
  == Everyone is busy/congested at this time (1:0/1/0)
    -- Executing [s@to_tech:11] Playback("SIP/372652136-00000055", "/var/spool/asterisk/tmp/noanswer") in new stack