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leblanc asked on

VoIP dhcp option

Can sombody help me to understand the option feature in the dhcp pool configuration for VoIP (see sample below)?

ip dhcp pool Data
   network x.x.x.x 255.255.255.0
   default-router x.x.x.1
   dns-server x.x.x.x y.y.y.y.y
   option 242 ascii L2Q=1,L2QVLAN=5
   option 176 ascii L2Q=1,L2QVLAN=5
!
ip dhcp pool VoIP
   network x.x.x.x 255.255.255.0
   default-router x.x.x.1
   option 242 ascii MCIPADD=x.x.x.x,x,x,x,x,MCPORT=1719,HTTPSRVR=x.x.x.x,TFTPSRVR=x.x.x.x,VLANTEST=0
   option 176 ascii MCIPADD=x.x.x.x,x,x,x,x,MCPORT=1719,HTTPSRVR=x.x.x.x,TFTPSRVR=x.x.x.x,VLANTEST=0
IP TelephonyNetworkingNetwork Architecture

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Ken Boone

8/22/2022 - Mon
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Ken Boone

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ASKER
leblanc

But those options can be configured on the DHCP server like Windows Server for example. Correct?
I will have to specify those options if I configure my router as a DHCP server. Correct?

I will be using NEC VoIP phones itl-8ld-1 dt730. Do you know if they mark the traffic automatically. I could not find any document on how to configure the Cisco switch with NEC VoIP phones. Thanks
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Ken Boone

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ASKER
leblanc

NEC phones use 802.1q trunking. But I am not sure if they mark the packet with dscp or cos.
Ken Boone

That would be a question for NEC, however, you could have the switch mark the traffic on the ingress port.
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ASKER
leblanc

I assume that the phone marks the packet and my switch just trust dscp or cos. That's how the Cisco phone works.
Ken Boone

I would assume the same thing..  I do know several years ago that one of the manufacturers did not have their stuff marked but that was a long time ago.