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New Member

VG224

Hello all

we have a problem with a VG224 Gateway. We connected it to our Callmanager

4.2(3) and configured some ports (MGCP). When we want to make a call from a

phone attached to the VG224 the destination phone rings and I can pick up the

call. However I don't get a voice connection. The call terminates and I get the

busy signal. After that I have to reboot the Port on the VG224.

What is the recomended IOS to run a VG224 on CCM 4.2(3)?

Has anyone a configuartion example for MGCP (and/or SCCP)?

Has anyone an idea??

Thanks Reto

10 REPLIES
Bronze

Re: VG224

Little confused - does that happen for all calls, or just some?

New Member

Re: VG224

Make sure your analog devices are in a Device Pool with a Region that is G711 to everything. I have seen this before when trying to use G729 on analog

New Member

Re: VG224

This happens to all calls on al ports of the VG224.

I can dial , the phone rings, pick up the phone the port on the VG224 disconnects and I get the dial tone (and have to reboot the port). This also happens in the other direction if I call a phone on the VG224.

Reto

New Member

Re: VG224

Hello

It seems that the problem is related to T.38 (see packet capture below):

No. Time Source Destination Protocol Info

34 7.574297 MGCP MDCX

205 AALN/S2/1@gw MGCP 0.1

Frame 34 (208 bytes on wire, 208 bytes captured)

Ethernet II,

Internet Protocol,

User Datagram Protocol, Src Port: 2427 (2427), Dst Port: 2427 (2427)

Media Gateway Control Protocol

MDCX (ModifyConnection)

Transaction ID: 205

Endpoint: AALN/S2/1@gw-test-fx1.hel.kko.ch

Version: MGCP 0.1

[The response to this request is in frame 36]

Parameters

CallId (C): A0000000010000b0000000F5

ConnectionIdentifier (I): A

RequestIdentifier (X): 9

LocalConnectionOptions (L): L: p:20, a:PCMU, s:off, t:b8, fxr/fx:t38

Packetization period (p): 20

Codecs (a): PCMU

Silence Suppression (s): off

Type of Service (r): b8

Unknown parameter: fxr/fx:t38

ConnectionMode (M): recvonly

RequestedEvents (R): L/hu

QuarantineHandling (Q): process,loop

No. Time Source Destination Protocol Info

36 7.577209 MGCP 510 205

fx: setting cannot be supported

Frame 36 (82 bytes on wire, 82 bytes captured)

Ethernet II,

Internet Protocol,

User Datagram Protocol, Src Port: 2427 (2427), Dst Port: 2427 (2427)

Media Gateway Control Protocol

Response Code: The transaction could not be executed, because a protocol

error was detected. (510)

Transaction ID: 205

Response String: fx: setting cannot be supported

[This is a response to a request in frame 34]

[Time from request: 0.002912000 seconds]

Any ideas??

Thanks Reto

New Member

Re: VG224

Can you post the MGCP portion of your config? Do you have the command "mgcp fax t38 inhibit" in there?

New Member

Re: VG224

mgcp

mgcp call-agent cmt1 service-type mgcp version 0.1

mgcp fax t38 inhibit

That's the mgcp part of our config.

Reto

New Member

Re: VG224

Try adding the following lines and see how it goes...this is the config I had on a functioning VG224. Also, you may want to use the IP address of the CallManager rather than the hostname.

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 rtp payload-type g726r16 static

After you add and save the commands, reload the VG.

New Member

Re: VG224

We solved one part of our problem. We loaded IOS 12.4.13 to the Gateway and applied the commands recommendes in the Release Notes for Cisco Unified CallManager Release 4.2(3)

? no mgcp fax t38 inhibit

? mgcp package-capability fxr-package

? no ccm-manager fallback-mgcp

Everthing works fine with G729b codec. If we switch to PCMU (G711u) we can make calls from the Gatway to a phone using G711. However if I want to make a call to a analog phone attached to the VG224 with G711 the phone rings. I can pick up the phone but the caller gets a ringing tone from the gateway.

Any ideas why G711 behaves like this??

Reto

New Member

Re: VG224

Our Gateways work now with the following configuration

IOS: 12.4.8 (12.4.13 did NOT work)

Adding the following commands:

no mgcp fax t38 inhibit

mgcp package-capability fxr-package

no ccm-manager fallback-mgcp

And everything worked.

Thanks for your help and support.

Reto

New Member

Re: VG224

HI, Can you please send me the working configuration of your VG224, 'cause i'm having a similar kind of problem with my box and I want to check the correct configuration.

email: ahmer74@hotmail.com

Thanks in advance

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