asterisk: rejected because extension not found in context ‘from-ipphone‘

rejected because extension not found in context ‘from-ipphone’
当拨打asterisk电话的时候，显示这个rejected because extension not found in context 'from-ipphone’错误，就是配置上下文错误导致的
我的原来配置

sip.conf

[general]
context = default
bindport = 5065
bindaddr = 0.0.0.0
tcpbindaddr = 0.0.0.0
tcpenable = yes

[1001]
type = friend
callerid = User One
username = 1001
secret = 1001
host = dynamic
canreinvite = no
context = from-ipphone
dtmfmode = rfc2833
mailbox = 1001
allow=all
;disallow = all
;allow = ulaw
;transport = udp

[1002]
type = friend 
callerid = User Two
username = 1002
secret = 1002
host = dynamic
canreinvite = no
dtmfmode = rfc2833
mailbox = 1002
context = from-ipphone
allow=all
;disallow = all
;allow = ulaw
;transport = udp

extensions.conf

[general]
static=yes
writeprotect=no

[default]
exten => 1001,1,Answer()
exten => 1001,n,Dial(SIP/1001,20,tr)
exten => 1001,n,Hangup

exten => 1002,1,Answer()
exten => 1002,n,Dial(SIP/1002,20,tr)
exten => 1002,n,Hangup

修改 extensions.conf

[general]
static=yes
writeprotect=no

[from-ipphone]
exten => 1001,1,Answer()
exten => 1001,n,Dial(SIP/1001,20,tr)
exten => 1001,n,Hangup

exten => 1002,1,Answer()
exten => 1002,n,Dial(SIP/1002,20,tr)
exten => 1002,n,Hangup

修改之后重启asterisk-16.2.0,在控制台可以看到成功了，

参考：配置asterisk ip电话