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Gerson Fabian Morales Marin
Community Member




Voice Gateway C3845 -----MGCP-----Call Manager

Call Manager=

Voice Gateway Configuration

Configure PRI on the Voice Gateway

Refer to link


1- Enable MGCP protocol.

2- Add the call-agent ip address (Call Manager's IP)

CUCM-3845B(config)#mgcp call-agent service-type mgcp
CUCM-3845B(config)#CCM-manager config Server
CUCM-3845B(config)#mgcp dtmf-relay voip codec all mode <mode>

cisco         Set mgcp dtmf-relay mode to be cisco
disabled    Set mgcp dtmf-relay mode to be disabled
nse           Set mgcp dtmf-relay mode to be nse
nte-ca       Set mgcp dtmf-relay mode to be nte-ca
nte-gw       Set mgcp dtmf-relay mode to be nte-gw
out-of-band  Set mgcp dtmf-relay mode to be out-of-band

NSE= NSE  based DTMF-Relay method uses payload type (PT) = 100 by default. This  method is also Cisco proprietary. Again, DTMF-Relay mechanism is not  carried out in SDP messages and is not negotiated. Each GW uses its  local configuration to make the decision of DTMF-Relay method and PT  value. Thus both ends should be configured with the same parameters for  the setup to work. This method also can't be considered as GW-Controlled  or CA-Controlled since negotiation isn't present, neither directly nor  through CA.
NTE-CA= MGCP  RTP-NTE has two implementations, which are Call Agent (CA) Controlled  and Gateway (GW) Controlled. In CA-controlled mode, CA will negotiate  DTMF relay capabilities on behalf of the gateways (SDP messages are sent  to CA). This is required in a setup where the other GW/Endpoint is  non-MGCP. After negotiation, CA instructs the MGCP gateway to use the  negotiated PT values.
NTE-GW= This  is the other implementation of MGCP RTP-NTE. In GW-controlled mode, GWs  negotiate DTMF transmission and RTP PT values by exchanging capability  information in SDP messages. This transmission is transparent to the CA  (Call Agent). This would work in a setup where both GWs are running MGCP  and connected to the same CUCM.
OUT-OF-BAND= In  OOB method, DTMF events will be signaled to CUCM using MGCP protocol  messages. To be more specific MGCP NTFY messages will be sent to CA.  After any digit is received by MGCP GW and signaled to CUCM, CUCM will  send RQNT message to the GW. This message will ask the GW to monitor the  events of DTMF Digits, Fax-Relay (FXR), and T.38 Relay

CUCM-3845B(config)#ccm-manager mgcp
CUCM-3845B(config)#ccm-manager redundant-host  <1st backup> <2nd backup>


Note: If exist secondary servers that we can use as backup add the command above.

CUCM-3845B(config)#ccm-manager switchback ?
  graceful        Graceful switchback
  immediate      Immediate switchback
  never              Never switchback
  schedule-time  Scheduled time (next 24 hours) switchback
  uptime-delay   Up time delay switchback


Not specified (default) – Means no switchback
Graceful -- Switches back after last active call ends.
Immediate -- Switches back as soon as TCP link to primary is established.

Verify MGCP configuration on Voice Gateway

Show ccm-manager

3- Go to the Interface Serial generated for the PRI and make sure to have the command

isdn bind-l3 ccm-manager

4- Go to the Controller T1 1/0 and make sure to have the command

pri-group timeslots 1-24 service mgcp

MGCP commands Summary

CUCM-3845B(config)#mgcp call-agent service-type mgcp version 0.1
CUCM-3845B(config)#CCM-manager config Server
CUCM-3845B(config)#mgcp dtmf-relay voip codec all mode out-of-band
CUCM-3845B(config)#ccm-manager mgcp
CUCM-3845B(config)#ccm-manager redundant-host  <1st backup> <2nd backup>
CUCM-3845B(config)#ccm-manager switchback graceful

CUCM-3845B(config)#controller t1 1/0
CUCM-3845B(config-controller)#pri-group timeslots 1-24 service mgcp

CUCM-3845B(config)#interface Serial1/0:23
CUCM-3845B(config-if)#isdn bind-l3 ccm-manager


At this point our MGCP configuration is done on the Voice Gateway. Let's move to Call Manager.

On Call Manager

1- Go to Cisco Unified Administration >Device >Add New >(select your Voice Gateway model) > Click next > Protocol MGCP> Next.


Note: Make sure to use the correct "Domain name" compose  by the hostname of the router and the domain.
Verify the correct host name using the "show ccm-manager" command.

2- Add the correct " Slots, VICs and Endpoints".

Verification on your Voice Gateway

1- Run "show inventory" and verify the slots and cards available.

We are going to use "NM-HDV2-2T1/E1" on Slot 1 base on our available cards. 

3- Add the correct card information on Call Manager.

4- Verify that the correct T1-PRI on the Voice Gateway match with the results on Call Manager. Make sure to click save every time you select something.

In my example I configured only controller T1 1/0 reason why it is the only UP.

5- Now go to the 1/0 port and select "Digital PRI" and click next.

6- Apply your configuration and how you want it to work with Call Manager.

7- Click Save>Apply configuration >reset.


At this point your T1-PRI should be registered on Call Manager.

Show Commands

Show commands
show ccm-manager
show ccm-manager backhaul
show ccm-manager hosts
show controllers t1
show mgcp statistic

Related links

Thanks for checking.


Gerson Fabian Morales Marin (gersomor)






Thanks for the document.It's very helpful.


This is very good thank you!

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