ISR 4331 - Not Enough Resources

[Flo.Matalis]

Hi Expert,

Router: ISR 4331

IOS: isr4300-universalk9.16.06.04.SPA.bin and isr4300-universalk9.03.16.04b.S.155-3.S4b-ext.SPA.bin

I am configuring E1 controller and I got this error:

ROUTER(config)#controller E1 0/1/0
ROUTER(config-controller)#pri-group timeslots 1-31 service mgcp
% Not enough DSP resources available to configure pri-group on controller E1 0/1/0
% The remaining dsp resources are enough for 0 time slots.

These are from my inventory:

NAME: "Chassis", DESCR: "Cisco ISR4331 Chassis"
PID: ISR4331/K9 , VID: V04 , SN: XXXXXXX

NAME: "Power Supply Module 0", DESCR: "250W AC Power Supply for Cisco ISR 4330"
PID: PWR-4330-AC , VID: V03 , SN: XXXXXXX

NAME: "Fan Tray", DESCR: "Cisco ISR4330 Fan Assembly"
PID: ACS-4330-FANASSY , VID: , SN:

NAME: "module 0", DESCR: "Cisco ISR4331 Built-In NIM controller"
PID: ISR4331/K9 , VID: , SN:

NAME: "NIM subslot 0/1", DESCR: "NIM-2MFT-T1/E1 - T1/E1 Serial Module"
PID: NIM-2MFT-T1/E1 , VID: V05 , SN: XXXXXXX

NAME: "PVDM subslot 0/4", DESCR: "PVDM4-64 Voice DSP Module"
PID: PVDM4-64 , VID: V02 , SN: XXXXXXX

NAME: "NIM subslot 0/0", DESCR: "Front Panel 3 ports Gigabitethernet Module"
PID: ISR4331-3x1GE , VID: V01 , SN:

NAME: "module 1", DESCR: "Cisco ISR4331 Built-In SM controller"
PID: ISR4331/K9 , VID: , SN:

NAME: "module R0", DESCR: "Cisco ISR4331 Route Processor"
PID: ISR4331/K9 , VID: V04 , SN: XXXXXXX

NAME: "module F0", DESCR: "Cisco ISR4331 Forwarding Processor"
PID: ISR4331/K9 , VID: , SN:

ROUTER(config-controller)#do sh voice dsp group all
DSP groups on slot 0/4 slot id 4
dsp 1:
State: UP, firmware: 46.2.6
Max signal/voice channel: 64/64
Max credits: 960, Voice credits: 960, Video credits: 0
num_of_sig_chnls_allocated: 0
Transcoding channels allocated: 0
Group: FLEX_GROUP_VOICE, complexity: FLEX
Shared credits: 960, reserved credits: 0
Signaling channels allocated: 0
Voice channels allocated: 0
Credits used (rounded-up): 0
Slot: 0/4
Device idx: 0
Dsp Type: SP2700

There's no channels allocated yet but why am I getting below. I have not configured any transcoder nor conference resources yet.

"The remaining dsp resources are enough for 0 time slots."

Tried to use the DSP calculator and need to increase our DSP but I need to understand first why we are getting above error. Also, since we already have PVDM4-64, instead of adding PVDM4-128, can we add PVDM4-64?

DSP Module Allocation:
	NIM 0: PVDM4-128

Call Volume Allocation:
		Low	Med	High
	NIM 0: NIM-2MFT-T1/E1(E1)	50	5	5

Transcoding Low Comp: 5
Conference 8 Party G.711: 4

Thanks in advance!

[Jaime Valencia]

Is the PVDM on the NIM or MB?

[Flo.Matalis]

Hi Java,

It is in MB.

[Jaime Valencia · Accepted solution]

The motherboard PVDMs are supported on all Cisco 4000 Series ISRs. They can be plugged directly into the single slot on the router motherboard or into the network interface module (NIM) that supports T1/E1 ports. A PVDM4 module plugged into the motherboard delivers IP-based voice services such as conferencing, media optimization, and transcoding only.

A PVDM4 module plugged into the T1/E1 NIM would be used for voice T1/E1 connectivity. Any excess channels can be reused toward other IP-based services supported on the motherboard slot. Enhanced DSP architecture accommodates a new packet-processing engine optimized for rich-media voice applications, while concurrently supporting the TDM-IP voice framework.

The PVDM enhanced services modules are supported on ISRs that contain an SM-X slot - namely the Cisco 4331, 4351, and 4451 ISRs. The SM-X modules support only IP-based voice services and cannot be used for TDM applications.

https://www.cisco.com/c/en/us/products/collateral/routers/4000-series-integrated-services-routers-isr/data_sheet_c78-728307.html

[Flo.Matalis]

Thanks Java! This is very helpful!

Just to confirm my understanding. Since this is an on board PVDM, we cannot use this for T1/E1 connectivity. This can only be used for conferencing, media optimization, and transcoding only. So if we need for T1/E1 connectivity, we need to have an additional PVDM that is plugged in into NIM.

[Jaime Valencia]

It would be up to you and your sizing for resources, either you move the PVDM to the NIM or buy another one for the NIM. Your choice.