Question on VG202

[Mohsin Khan Feroz]

Hi,

I have 2 VG202 at my site and it is running with SCCP. I need to configure a SRST on it when my CUCM is unreachable, atleast the calls between these 2 VG202s should work. But unfortunately I do not have a SRST GW at my site. Is it possible to make it work?

Mohsin,

[singhaam007]

Hello Mohsin,

Yes you can configure one like this

call-manager-fallback

secondary-dialtone 1

max-conferences 8 gain -6

transfer-system full-consult

timeouts interdigit 3

ip source-address XXXXXport 2000

max-ephones 25

max-dn 50

transfer-pattern .T

alias 1 3596318 to 8988

alias 2 3596290 to 8960

alias 3 3596309 to 8979

alias 4 3596320 to 8950

alias 5 3596316 to 8986

alias 6 3596343 to 8913

alias 7 3596311 to 8981

date-format dd-mm-yy

you can only maximum 25 phones in one group.

Check this link for more details

http://blog.ipexpert.com/2012/03/07/high-availability-series-1-srst-base-configuration/#more-10399

please rate if this helps.

thanks

[Mohsin Khan Feroz]

Hello,

The above configs are to be done on the SRST GW but not on the VG202. There is no command for call-manager-fallback on the VG202 though we are with in the IOS chain of 15.3

In my case, I have no SRST GW at my site so the VG202 will not register with it..

Mohsin.

[singhaam007]

Cisco 112-FXS Bundle, Cisco VG 224, Cisco VG 204 and Cisco VG 202 have built-in Media Gateway Control Protocol (MGCP) failover to an H.323 connection to a Survivable Remote Site Telephony (SRST) router. This failover will maintain voice service for analog endpoints in the event of WAN link failure and lost connectivity to the Cisco Unified Communications Manager.

http://www.cisco.com/en/US/prod/collateral/voicesw/ps6790/gatecont/ps2250/ps5516/product_data_sheet09186a00801d87f6.html

find some thing good

MGCP can Fallback to H323 or SIP, provided you should be having dial-peers configured in the VG20X.

Configuration on VG20X Gateway:

MGCP FALL BACK command to pick up alternate signalling (h323 or sip)

(config)#call application alternate default (whereas default is H323)

Command to bring the VG20X in SRST Mode:
(Config)#call-manager-fallback
(config-cm-fallback)# max-ephones 10 (Number of phones which are in Remote Site, connected to VG20X)
(config-cm-fallback)# max-dn 10 (Number of DN's)
(config-cm-fallback)#ip source-address X.X.X.X  (Source address for your phones to register in SRST)

Configuration on CUCM :

After all this you got to add a SRST Reference in CUCM with the IP X.X.X.X on VG20X.

https://supportforums.cisco.com/thread/2067429

thanks

[Mohsin Khan Feroz]

Great,

This is for MGCP, is there anything for SCCP?? Since I am on SCCP..

[singhaam007]

Hello,

here is the example for sccp.

http://www.cisco.com/en/US/docs/ios/voice/fxs/configuration/guide/fxssrst.html

please rate if this helps.

thanks