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T1 CAS/MGCP

shouyisun
Level 1
Level 1

Here is my current scenario: PBX has 2 T1 PRI to PSTN and 1 T1 CAS to a Motorala FRAD which connects to FR to remote office providing inter-office calling(remote site has the same devices). We are going to replace the PBX with CCM and GW. The topology gonna be 2 PRI off the router connecting to PSTN and 1 T1 CAS off the router to motorola FRAD for interoffice calling. I have done a lot of PRI/MGCP configuration, but with less T1 CAS experience.I am going to use MGCP. The question I have here: What information should I gather in order to configure the T1 CAS? Any different in terms of MGCP between the PRI and CAS? Thanks

4 Replies 4

adignan
Level 8
Level 8

Your MGCP setup will be the same. Only differenece will be in the Gateway Setup you will select T1 CAS as the signalling as opposed PRI. After that, if you have ccm-manager config in your setup, everything will be setup. CM will add the ds0 group and serial :0 interface. I pasted in a config from a T1 Cas/MGCP router:

voice rtp send-recv

!

voice class codec 1

codec preference 1 g711ulaw

codec preference 2 g729r8

codec preference 3 g729br8

!

no voice hpi capture buffer

no voice hpi capture destination

!

ccm-manager fallback-mgcp

ccm-manager redundant-host 192.168.x.x

ccm-manager mgcp

ccm-manager music-on-hold

ccm-manager config server 192.168.x.x

ccm-manager config

!

!

controller T1 0/0

framing esf

linecode b8zs

ds0-group 1 timeslots 1-24 type e&m-wink-start

description VWIC-1MFT-T1 PSTN CAS T1

!

class-map match-all VoIP

match access-group name VoIP-ACL

class-map match-all VoIP-Control

match access-group name VoIP-Control-ACL

class-map match-all VoIP-CTIos

match access-group name VoIP-CTIos-ACL

!

!

policy-map VoIP-CTIos-LLQ

class VoIP

priority 320

class VoIP-Control

bandwidth 24

class VoIP-CTIos

bandwidth 32

class class-default

fair-queue

!

translation-rule 1

Rule 1 ^4205 6510

Rule 2 ^2471 3510

!

call application alternate DEFAULT

!

voice-port 0/0:1

input gain -3

output attenuation 3

echo-cancel coverage 32

!

voice-port 1/1/0

echo-cancel coverage 32

echo-cancel suppressor

no comfort-noise

timeouts wait-release 3

timing hookflash-out 50

description 911

music-threshold -70

!

voice-port 1/1/1

echo-cancel coverage 32

echo-cancel suppressor

no comfort-noise

timeouts wait-release 3

timing hookflash-out 50

description Page Port

music-threshold -70

!

mgcp

mgcp call-agent 192.168.x.x 2427 service-type mgcp version 0.1

mgcp dtmf-relay voip codec all mode out-of-band

mgcp rtp unreachable timeout 1000 action notify

mgcp package-capability rtp-package

no mgcp package-capability res-package

mgcp package-capability sst-package

no mgcp package-capability fxr-package

no mgcp timer receive-rtcp

mgcp sdp simple

mgcp fax t38 inhibit

mgcp rtp payload-type g726r16 static

mgcp bind control source-interface Loopback0

mgcp bind media source-interface Loopback0

!

mgcp profile default

!

!

!

!

dial-peer voice 14 voip

preference 1

application default

destination-pattern 42..

translate-outgoing called 1

voice-class codec 1

session target ipv4:192.168.x.x

no vad

!

dial-peer voice 999110 pots

application mgcpapp

incoming called-number .

port 1/1/0

!

dial-peer voice 999111 pots

application mgcpapp

incoming called-number .

port 1/1/1

!

dial-peer voice 999001 pots

application mgcpapp

incoming called-number .

port 0/0:1

!

dial-peer voice 9 pots

description 7-Digit - SRST

application default

destination-pattern 9[2-9]......

port 0/0:1

forward-digits 7

!

dial-peer voice 91 pots

description 10-Digit - SRST

application default

destination-pattern 91..........

port 0/0:1

!

dial-peer voice 911 pots

description 911 - SRST

application default

destination-pattern 9911

port 1/1/0

forward-digits 3

!

!

call-manager-fallback

limit-dn 7910 1

limit-dn 7940 2

limit-dn 7960 6

timeouts interdigit 3

ip source-address 192.168.x.x port 2000

max-ephones 30

max-dn 60

keepalive 10

default-destination 3610

voicemail 91800xxxxxxx

alias 1 6510 to 6510 preference 1

alias 2 6510 to 6537 preference 2

alias 3 6510 to 6536 preference 3

date-format dd-mm-yy

Thanks very much.So this is under the assumption that E&M is using wink-start. Right?

There are a bunch of different protocol types that can be used on a T1 CAS. Once the router is configured with the correct protocol type you can add this gateway under callmanager. I think callmanager only supports Delay dial and Wink start type of signalling on CAS gateways at this time. (3.3)

Sankar Nair
UC Solutions Architect
Pacific Northwest | CDW
CCIE Collaboration #17135 Emeritus

Thanks, guys.

One more question here: since my router is connecting to a Motorola FRAD,which connects to remote FRAD via FR and thus provides vofr for inter-office. Any special concern should I take, like who provides the clock , which one should be T1 DCE and so on. Thanks