block call-fwd on SIP phones

[ilana_ilana]

Hello,

I have cme 10.0 with 7821 sip phones and I want to block call-fwd all to PSTN numbers.

I have ISDN connection of 30 channels to CME.

I have tried blocking supplementary services using "no supplementary-service h450.3" and "no supplementary-service sip moved-temporarily " but no impact users are still able to activate call-fwd all.

[Marcelo Morais]

Hi,

 in CME 9.5 and later versions, once transfer patterns are configured in telephony-service configuration mode, the transfer patterns apply to both SCCP IP phones and SIP IP phones.
The transfer max-length command is used to indicate the maximum length of the number being dialed for a call transfer.

you can use the following configuration (for example):

(config)# telephony-service
(config-telephony)# transfer max-length 4

Hope this helps.

[ilana_ilana]

Hi Marcelo,

Requirement is to configure call forward all feature to internal extensions only (like 4digit) and restrict PSTN calls.

Transfer max-length 4 is going to work in call-forward all scenario ?

[Ayodeji Okanlawon]

Configure a call forward pattern with only 4 digits..

telephony-s

call-forward pattern 4...

where 4... is your internal digit pattern

This will limit the call forward only to internal extensions

[ilana_ilana]

Hello,

I tried call-forward pattern 4... under telephony-service but still i can call-forward all to 8digits mobile number.

transfer max-length 4 command is not available under telephony-service.

CME 10.5 IOS c3900-universalk9-mz.SPA.154-3.M4.bin.

Any idea why ?

[Manish Gogna]

Hi,

Can you try the following:

Router(config)# ephone-dn-template 1

Router(config-ephone-dn-template)# call-forward max-length 4

Router(config-ephone-dn-template)# exit

Router(config)# ephone-dn 1

Router(config-ephone-dn)# number XXXX

Router(config-ephone-dn)# ephone-dn-template 1

Manish

[ilana_ilana]

Hi Manish,

 I have SIP phones not SCCP

[Manish Gogna · Accepted solution]

This feature was not available for SIP phones until last month. You may check with TAC if there have been any updates regarding the same.

Manish

[ilana_ilana]

TAC confirmed.

This feature is not available for SIP till today.

Thanks guys for help.

[Manish Gogna]

Thanks for updating the post with the resolution.

Manish

[Vivek Batra]

Hi Manish and ilana,

Thanks for sharing this information [+5]. We have many threads open with this question and that will definitely help.

- Vivek

[Marcelo Morais]

Hi,

 you are right, the transfer max-length is a voice register pool command, not telephony-service.

Check the link CME Commands.

What happens if you insert this command in the voice register pool? Are you able to block the transfer to PSTN?

Regards

[ilana_ilana]

Hello,

i tried but still call fwd key is working for 4 digits and 8digits (pstn)

[Marcelo Morais]

Hi Ilana,

 thanks for the update (+5!!!).

 What TAC says about that?

"...

The following example shows how to configure the maximum length of the transfer number under voice register pool 1. Because the maximum length is configured as 5, only call transfers to Cisco Unified SIP IP phones with a five-digit directory number are allowed. All call transfers to directory numbers with more than five digits are blocked.

..."

Regads.

[ilana_ilana]

Hi Marcelo,

Following is the reply from TAC

"- As we discussed on the phone, unfortunately we don't have any commands in voice register global to provision call forward blocking to external numbers."

I will re-check again and will update here.

Regards