10-18-2010 03:37 PM - edited 03-16-2019 01:24 AM
I have two 3925 ISR routers with 4 pri's in each one.
I am hooked up to a Callmanager 7.1.5 under normal conditions running MGCP what
I am curious about is when I go into SRST mode, I want to use one gateway for the phones but what is the best way to use the pri's
in both gateways. I am not concerned about load balancing just that I can semd calls thru both gateways.
Any sample configs or ideas would be appreciated.
Thanks
10-20-2010 06:53 AM
You'll need to configure dial-peers on both of the gateways to allow call routing between them in an SRST situation.
For example,
GW1 has all the phones registered and two PRIs.(0/0/0:23 and 0/0/1:23)
GW2 has 2 PRIs and no phones registered. (0/0/0:23 and 0/0/1:23)
user dial 9 to make PSTN calls
Extension Range for GW1: 1xxx
Inbound DID for GW2 for calls from PSTN: 1xxx
GW2:
dial-peer voice 1 pots
destination-pattern 9.T
incoming called-number .
direct-inward-dial
port 0/0/0:23
dial-peer voice 2 pots
preference 1
destination-pattern 9.T
incoming called-number .
direct-inward-dial
port 0/0/1:23
dial-peer voice 3 voip
destination-pattern 1...
session target ipv4:
dtmf-relay h245-alphanumeric
incoming called-number 9T
codec g711ulaw
no vad
GW1:
dial-peer voice 1 pots
destination-pattern 9.T
incoming called-number .
direct-inward-dial
port 0/0/0:23
dial-peer voice 2 pots
preference 1
destination-pattern 9.T
incoming called-number .
direct-inward-dial
port 0/0/1:23
dial-peer voice 3 voip
preference 2
destination-pattern 9.T
session target ipv4:
dtmf-relay h245-alphanumeric
incoming called-number 1...
codec g711ulaw
no vad
For outbound calls, IOS will first try 0/0/0:23 and then 0/0/1:23 on GW1. If the call fails due to oversubscription, it will be routed to GW2 where it will try 0/0/0:23 and then 0/0/1:23.
Inbound calls that hit GW2 will be routed to GW1.
Let me know if you have any questions.
-Felipe
10-20-2010 07:31 AM
Thank You.. I was trying to make it work with trunk groups so I can cut down the dial-peers but for some reason the trunk groups do not seem to work in SRST mode. I have seen that issue reported in the forum with no fix that I found yet.
One of the reasons for trunk groups is one site has 8 pri's in each gateway so between the pots and voip dial peers the config starts to grow.. I did mangae to get away with one voip dial peer sending all patterns to gateway 2 which helped.
Thanks for the answer It works fine...
10-20-2010 08:34 AM
Glad I could help. How were you trying to implement the trunk groups? What did you experience when trying to make calls through them while in SRST mode?
-Felipe
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