Cisco ip phones

Hi

Currently we having issue to make outbound and inbound call.

We suspect firewall is blocking, how to resolve the issue in Cisco ip phones.
alanlam123Asked:
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Ken BooneNetwork ConsultantCommented:
Need a lot more info to help you..  What cisco phone system is this?  CUCM or CME?  How do you reach the PSTN?  PRI, SIP Trunk? other?  Was this working and then it broke?  What happened when it stopped working?
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masnrockCommented:
Like Ken mentioned, we need a LOT more information to be able to help. Glancing at your other questions, is it tied to the problems you've had since the MPLS change?
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Blue Street TechLast KnightCommented:
Yup, it is definitely the firewall without question! ;D
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Ken BooneNetwork ConsultantCommented:
Blue Street Tech - that was funny dude!
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alanlam123Author Commented:
Thanks for quick response.

Yes is CUCM and I believe is sip. There is no issue on IDD tested by teleco.

The actual issue started when the previous HQ remove MPLS link.

I have a look on the firewall I can see the vlan for voip is pointing to a different IP address , no sure the ip is causing the issue. In our environment we are using IP address of 10.0 but I found out the IP address is 172.0
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masnrockCommented:
I have a look on the firewall I can see the vlan for voip is pointing to a different IP address , no sure the ip is causing the issue. In our environment we are using IP address of 10.0 but I found out the IP address is 172.0
That would be a big problem if the inbound VoIP related traffic is going to 172.0 given the address scheme you've pointed out. What are your NAT and SIP inspection rules like for outbound traffic from the voice VLAN?
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Bryant SchaperCommented:
What symptoms do you have?  One way audio not registering?
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