Problem to transfer external calls

[Thiago Gandara]

Hi voice team,

I have a problem with CUCM 5.1, sometimes when I receive an external call, I can not transfer to another extension, I press the Transfer button and nothing happens, but it has moments that I can make the transfer. Does anyone know how to solve this problem?

Best regards,

Thiago Gandara

[Jaime Valencia]

If your GW is H323 you might need to check the MTP required and make sure there is an MTP available with enough resources.

HTH

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[Thiago Gandara]

The MTP checkbox is set.

Thanks.

[Bhunt 410]

As stated above usually when supplementary services aren't working its usually to some sort of media resorces.

1.  Ensure you have created media (MTP's in this case and have them assigned to a MRG.

2.  Ensure your phones have a MRGL assigned which can acess the MRG. 

If that doesnt work, turn on tracing and recreate the call and we can look at the trace, but more than likley we wont need that level of excitement tonght.

Good luck

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[Thiago Gandara]

I check the CUCM the MTP and MRGL is configured correctly, the phones have a MRGL assigned.

Thanks.

[Mohammed al Baqari]

Please elaborate more about your infrastructure.

1. What is the protocol used to connect PSTN GW to CUCM.

2. Where is the transfer to party (internal to CUCM or external)

Also, follow the suggestions raised by the team above.

[Thiago Gandara]

Hi Mohammed, the protocol is H.323, the problem occur with a external call, transfer internal calls works fine.

thanks.

[Ayodeji Okanlawon]

What version of IOS are you on. When you get intermittent issues like this, as I have experienced in the past an IOS upgrade helps.

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[Thiago Gandara]

The IOS version is:  System image file is "flash:c2800nm-adventerprisek9_ivs-mz.124-24.T4.bin"

Thanks.

[Mohammed al Baqari]

Hi,

Thx for the details. Now you said that when you press transfer softkey, nothing happens. Does it mean that you are not promoted to enter the transfer to number or you are able to dial transfer to number but the transfer can't be completed after this.

Does the phone who initiates the transfer to (transferor) resides in the LAN of CUCM.

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[Thiago Gandara]

Hi, sometimes when i press the transfer softkey nothing happens, but sometimes its work, the phone resides in the LAN of CUCM.

Thanks.

[Mohammed al Baqari]

What is the codec used between gateway and phone during active call. Are you using software or hardware MTP. In case hardware, what is the codec assigned and what is the max number of sessions.

[Thiago Gandara]

How i do to verify this information about the codec?

The codec used between gateway and phone is G.729.

Thanks.

[Thiago Gandara]

How i do to verify this information about the MTP?

[Bhunt 410]

IF you are using G729 are the calls coming in from the PSTN?  If so you will need to use a Hardware to transcode the call.  you can go look at your DSPFARM to se eif you have a transcoder configured with G729.  It should look simular to this

sccp local Loopback0

sccp ccm x.x.x.x identifier 2 version 7.0

sccp ccm x.x.x.x identifier 1 version 7.0

sccp

!

sccp ccm group 2

bind interface Loopback0

associate ccm 1 priority 1

associate ccm 2 priority 2

associate profile 4 register xxxx-MTP729

associate profile 3 register xxxx-MTP711

associate profile 2 register xxxx-CFB

associate profile 1 register xxxx-XCODE

!

dspfarm profile 1 transcode

codec g711alaw

codec g711ulaw

codec g729r8

maximum sessions 6

associate application SCCP