NFAS and Dial-Peers

[tpfrankli]

So I’ve got an NFAS setup in my lab and would like to just confirm something around dial-peers. According to the cisco documentation I should be creating a dial-peer referencing the port:D. However the router will not let me do that.

Documentation example:

http://www.cisco.com/en/US/docs/ios/voice/isdn/configuration/guide/vi_nfas_dch_bkup.pdf

The following example shows configuration of a POTS dial peer with the primary controller of an NFAS

group:

dial-peer voice 35 pots

incoming called-number 45...

destination-pattern 35...

direct-inward-dial

port 1/0/0:D

prefix 35

My configuration is as follows:

card type t1 0 0

card type t1 0 1

!

network-clock-participate wic 0

network-clock-participate wic 1

network-clock-select 1 T1 0/0/0

network-clock-select 2 T1 0/1/0

!

controller T1 0/0/0

cablelength long 0db

pri-group timeslots 1-24 nfas_d primary nfas_int 0 nfas_group 0

!

controller T1 0/1/0

cablelength long 0db

pri-group timeslots 1-24 nfas_d backup nfas_int 1 nfas_group 0

!

voice-port 0/0/0:23

!

voice-port 0/1/0:23

!

interface Serial0/0/0:23

no ip address

encapsulation hdlc

isdn switch-type primary-ni

isdn incoming-voice voice

no cdp enable

TL;DR

So the question is, can I just create a dial-peer pointed to 0/0/0:23 which is my primary D channel in the NFAS group and it will distribute the calls across all members?

Example:

dial-peer voice 100 pots

destination-pattern 9T

port 0/0/0:23

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[smahalingam]

Were you able to  resolve the above issue by just using the port 0/0/0:23 command ??

Appreciate you reply.

Thanks,

simah.

[tpfrankli]

That's correct pointing it at the primary D channel will distribute calls across all member PRIs.

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[chuck.brule]

NFAS Groups are really clunky and awful unless you run 4 or more PRIs at a given location. You really don't gain anything by building it as NFAS with only two PRIs.

Better to set it up as a trunk-group in that scenario. Less headache.

Chuck

[smahalingam]

But , then did you also configure the second set of dial-peers (with different preference) pointing it to the backup D channel Contoller as well ?? to support an event when the first PRI link is down ??

Thanks,

Simah.