How to configure the Cisco 7940G IP Phone for
Standalone SIP? It’s a common problem while using
the Cisco ip phone 7900 series. Now here we will share an example and case that
the user of Cisco 7940g phone has got…
And the discussion is likes this:
The Problem: “I have a Cisco 7940g IP telephone.
I do not have a PBX. This is simply an IP phone plugged
into a my LAN.
I just signed up Digium cloud SIP service.
Is there a way to make this work?
P.S. I tried entering the credentials that Digium sent
me into the "5. SIP Configuration" menu under
"SETTINGS" on the phone, but I still have an 'X' over my line on the
home screen.”
Someone
answered: “Digium is a very-well known company because of a VoIP product called
Asterisk.
Will the phone
work, of course? You have a choice of running SIP or Cisco-proprietary
SCCP.
We'll need to
do a top-to-bottom troubleshooting and configuration. Firstly, what
protocol are you planning to use (SIP or SCCP) and what configuration settings
does Digium require you to do from your side?”
In fact the user
wants to run SIP. He does not have any PBX or other Cisco phone hardware
outside of this 7940g phone sitting on desk.
He has
factory-reset the phone, and entered the credentials Digium gave him.
Settings > 4.
SIP Configuration > 1. Line 1 Settings:
1. Name = (the
user’s assigned Digium phone number)
2. Shortname= (his
name)
3.
Authentication Name=56605ed547a8437d872f6b516df6a4bc
4.
Authentication Password = (another random string of characters just like the
previous field)
5. Display Name
= UNPROVISIONED
6. Proxy Address
= sip.digiumcloud.com
7. Proxy Port =
5060
And he have
confirmed with our sysadmin that the network's router is set to (1) disable
"SIP helper", and (2) allow communication on specific UDP port
ranges, both per Digium's knowledgebase.
…Those
configuration are not enough.
Ask Digium if
NAT & ALG are supported.
What transport
protocol does Digium support: TCP or UDP
What codec is
allowed?
The Cisco IP
Phone 79X5 family of phones behave differently. It's not like the IP
Phone 79X0 where the configurations are simple. You'll need to upload the
complete set of configurations to the phone using DHCP Option 150 and a TFTP
server.
…Any more
suggestions? Share with us…
From https://supportforums.cisco.com/discussion/12721381/configuring-cisco-7940g-phone-stanalone-sip
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