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SRST. IP phones don't try to register on a SRST device

MaximBudyonny
Level 1
Level 1

I'm trying to setup SRST in the test environment.

Troubles:

Additional CallManager doesn't appear in a Phone config

when I'm disabling CCM, IP phones don't try to register on a SRST device.

Test environment contains:

1 CCM 4.1(3) IP=10.0.0.12

2 IP Phones 7912 IP=10.100.0.X (default gataway 10.100.0.1)

1 cisco2851 router - SRST device and MGCP gateway IP=10.100.0.1, 172.16.16.1

cisco2851 is registered on a CCM

SRST reference SRST-2 is created onto a CCM. It points to 10.100.1.0

Gateway and IP phones are members of a device pool - default.

The SRST Reference in this device pool is pointed to a SRST-2.

Network routing works properly.

Below is a part of cisco2851 config (some lines was omitted)

DHCP:

ip dhcp pool IP_PHONES

network 10.100.0.0 255.255.255.0

default-router 10.100.0.1

option 150 ip 10.0.0.12

MGCP GW:

voice-port 0/0/0

cptone RU

voice-port 0/0/3

cptone RU

!

ccm-manager fallback-mgcp

ccm-manager mgcp

ccm-manager music-on-hold

ccm-manager config server ccm-test

ccm-manager config

!

mgcp

mgcp call-agent ccm-test 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 modem passthrough voip mode nse

mgcp package-capability rtp-package

no mgcp package-capability res-package

mgcp package-capability sst-package

no mgcp package-capability fxr-package

mgcp package-capability pre-package

no mgcp timer receive-rtcp

mgcp sdp simple

no mgcp explicit hookstate

mgcp rtp payload cisco-pcm-switch-over-ulaw 126

mgcp rtp payload cisco-pcm-switch-over-alaw 126

mgcp rtp payload-type g726r16 static

!

mgcp profile default

!

dial-peer voice 1 pots

service mgcpapp

port 0/0/1

!

SRST:

call-manager-fallback

max-conferences 8 gain -6

transfer-system full-blind

ip source-address 10.100.0.1 port 2000

max-ephones 30

max-dn 100

system message primary CM Fallback Service

system message secondary CM Fallback Service

keepalive 60

time-zone 26

time-format 24

date-format dd-mm-yy

application

global

service alternate Default

----------------------------------

output of "show call-manager-fallback"

CONFIG [Version=3.4(0)]

========================

Version 3.4(0)

For on-line documentation please see:

http://www.cisco.com/univercd/cc/td/doc/product/access/ip_ph/ip_ks/index.htm

ip source-address 10.100.0.1 port 2000

max-ephones 30

max-dn 100

max-conferences 8 gain -6

dspfarm units 0

dspfarm transcode sessions 0

huntstop

time-format 24

date-format dd-mm-yy

timezone 26 E. Europe Standard/Daylight Time

keepalive 60

timeout interdigit 10

timeout busy 10

timeout ringing 180

caller-id name-only: enable

system message primary CM Fallback Service

system message secondary CM Fallback Service

Limit number of DNs per phone:

Log (table parameters):

max-size: 150

retain-timer: 15

transfer-system full-blind

local directory service: enabled.

output of "show debug"

EPHONE state debugging is enabled

EPHONE registration debugging is enabled

EPHONE ccm-compatibility debugging is enabled

for 30 ephones (too many to list)

But there are no debug messages

17 Replies 17

Hi,

What the firmware of IP Phone 7912 installed on your phone?

In my IP Phone 7912 - CP7912080001SCCP051117A.

Regars,

Andrew.

I have CP7912080001SCCP051117A phoneload too.

Version of CCM 4.2(1). SRST version is 3.3. IOS 12.4(3b) or 12.4(10). I founded that IP of SRST reference in CCM configuration MUST be equal IP of default gateway in SRST gateway. This is applicable only for 7912 Phone. For 7940/60 IP of SRST reference may differ from IP of default gateway. When I changed SRST ref to default gateway, my 7912 goes to SRST immediatily whether the CCM works or not. And I couldn't force 7912 back to CCM. Note, I had TFTP timeout messages at 7912 log screen. Only after shutting down SRST my 7912 came back to CCM. But after the last reset of 7912 I didn't see any message about SRST in 7912 configuration. I check CPxxxxx.cnf.xml from TFTP and see the SRST reference in it. Why does the 7912 Phone lose the SRST configuration and how to force to insert the IP of SRST in 7912 configuration? Resetting, deleting and making new phone, changing SRST reference at CCM administration was not successful. Routing and switching are good. Keepalive of CCM Publisher is 30 sec, of Subscriber is 60 sec. Keepalive of SRST is 30 sec.

Sergei

Well, I resolved this issue.

Trouble was in DNS name of CallManager server in ccmadmin configuration. When I changed to IP address from DNS name 7912 successfully fallback to SRST and switch over to CCM.

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