The SIP extension in question serves a Cisco 7960 phone (whereas all others serve 7970s). I went through the various steps to configure the phone and it is able to make calls as desired. No Issue there.
However, I am unable to call the extension. It seems like the phone is not connected, which does not make any sense, since it can make calls through the extension.
sip show peers shows:
Name/username Host Dyn Forcerport ACL Port Status
838 (Unspecified) D A 0 Unmonitored
which is different from all other phones where it shows the IP address of the phone.
The extension's settings (configured through the UI) are:
[838]
deny=0.0.0.0/0.0.0.0
secret=**********
dtmfmode=rfc2833
canreinvite=no
context=from-internal
host=dynamic
trustrpid=yes
sendrpid=no
type=friend
nat=no
port=5060
qualify=no
qualifyfreq=60
transport=udp
encryption=no
callgroup=
pickupgroup=
dial=SIP/838
mailbox=838@default
permit=0.0.0.0/0.0.0.0
callerid=xxx <838>
callcounter=yes
faxdetect=no
Which is the same as all other extensions (except for the numbers of course).
I am pretty much lost where to look. Any help would be appreciated.