One way connection between BCM50 and CS1000

[INTonline]

Let me start by saying that I am not a phone system guy but understand a little bit about them.

Ok my situtation is that I have a remote location that has a BCM50 system and my home office has a CS1000 system (these are linked by a private mpls network on different subnets). We are attempting to link these with a SIP trunk so that we can dial 4 digit extensions to and from each office.

Currently we are able to dial a 4 digit extension from the BCM side to the CS1000 side. From the CS1000 side we immediately get a "release and try again" followed by fast busy.

The odd thing is that I can setup an IP phone in the office that uses the BCM50 system and register it to the CS1000 and it is able to call the phones on the BCM50 with 4 digit extensions. The only difference is that the IP phone there is on the same subnet as the BCM50 and the one here in my office is on a seperate subnet.

Any help would be appreciated, both the telephone contractor we hired and myself are at our wits end.

 

[biv343]

My first guess is an IP routing issue, or a missing default gateway in the BCM. Can the BCM ping the devices such as the sig server, VGMC, MGCs at the CS1000 location?

 

[INTonline]

How can I test pinging in the bcm?

 

[INTonline]

Default gateway is set properly in the BCM and in CS1000

 

[INTonline]

Attached is a diagram that may help you

Summary of Diagram:

Telephone 1 is in a sepereate subnet and location

Telephone 2 and 3 are in the same subnet and location

Telephone 1 and 3 are registered to the CS1000

Telephone 2 is registered to the BCM50

Telephone 1 can dial Telephone 3

Telephone 3 can dial both Telephone 2 and 1

Telephone 2 can dial to Telephone 1

Telephone 1 cannot dial Telephone 2

 

[INTonline]

found the ping and yes i am able to ping anything in the phone system.

 

[YnotPhone]

Hi there, it sounds like an IP routing issue to me too.

The MPLS system handles the data and the voice traffic correct?

I see the BCM50 having all the correct information to route to the CS1000 (therefore the calls are connected), but the CS1000 only knows the set on the BCM50 as an external IP address, therefore sending the packets through to the data network, which then these packets gets lost in cyberspace.

 

[INTonline]

the mpls is a private point to point t1 connection basically, and it only handles data traffic. SIP trunking is VOIP as i understand.

also we have servers and workstations on both of these subnets that talk to each other with no problems.

 

[Dasheen]

vlans setup?
does the payload on both systems match?

 

[INTonline]

I have VLAN setup in the CS1000 but I do not see one in the BCM, and I do not know where to check the payload... Where should I look?

 

[Dasheen]

payload on bcm is found under sip tab. same place where u setup whether to use g711, etc. not sure where it is on cs1k. both need to match as u could have one way communication.

Was asking if network had sperate vlan for voice and one for data.

 

[INTonline]

I do not see a sip tab in the element manager...

 

[INTonline]

nevermind i think i found it its under resources>telephony resources>internal ip sets

 

[INTonline]

ok for anyone else who may have this issue the payload setting for the cs1000 are under
ipnetwork>
nodes,servers,mediacards>
vgw and ip phone codec profile>
codec g711>

ok here are my settings:
from cs1000 for g711>
voice payload size = 20
voice payout (jitter buffer) nominal delay minimum = 40
" " " " " " maximum = 80


from bcm 50>

enable registration (checked)
enable global reg password (checked)
auto assign dns (not checked)
play dtmf tone (not checked)
default codec = auto
default jitter buffer = auto
g729 payload = 30
g723 payload = 30
g711 payload = 30

obviously i see the discrepancy between g711 payload, should that be changed?

 

[INTonline]

and to answer, no seperate vlan fro voice and data, also thanks a lot for your help!

 

[Dasheen]

yes change either the bcm side or the pbx side. make both sides match.

 

[INTonline]

is there a preferred payload? does this effect bandwidth?

 

[INTonline]

ok, i found another place for these settings and they matched...

i did however find in the bcm that there is nothing in the routing table under ip trunks, should there be something there?