Supplementary services on analogue phones without a call agent

Unanswered Question
Apr 15th, 2009

A quicq question:

Is it possible to have supplementary services such as hook-flash call forward on analogue phones connected to FXS ports without using a call agent such as CallManagwer or CME. Basically I set up a dial-peer to the FXS port and can make calls, but cannot transfer calls. Do I need a call agent?



  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Paolo Bevilacqua Wed, 04/15/2009 - 05:16

You can do that with TCL/IVR scripts. The transfer one is provided already in the CME area.

torsten.brink Tue, 06/02/2009 - 13:43

Hi Forum,

has anyone a more detailed answer for this topic?

My installation is a VG224 (with FXS ports), connected via SIP Trunk to a CUCM.

These fxs ports need to be forwarded to a e.g. voicemail system.

How can this be achieved? is there a tcl script for that? as I don't use a CallAgent like CME or CUCM.

Thanks in advance



Paolo Bevilacqua Fri, 06/05/2009 - 10:11

Configure the FXS ports in SCCP mode instead of SIP trunk.

You will be able to configure the port as an ip phone and all features will become available.

torsten.brink Fri, 06/05/2009 - 11:20

As far as I know there's no possiblilty to use the vg224 in sccp without a CUCM or CME????

And the requirement was having this feature without a call control.



Nicholas Matthews Fri, 06/05/2009 - 11:30

Hi Torsten,

As of now there is not a Cisco provided script that will do call forwarding after a certain amount of rings or timeout. There is one for transfers, however.

You would need to use SCCP/MGCP with CUCM or 3rd party MGCP 1.0 to accomplish this.

FWIW, the IAD platforms also support SIP-based hookflash transfers, but this requires support from another call agent.

You either need a custom TCL script or a compatible call agent.


torsten.brink Fri, 06/05/2009 - 13:17

Hi Nick thanks for your response, it seen that there no other way, except with a tcl script. Maybe I get it to work :-)



Paolo Bevilacqua Fri, 06/05/2009 - 11:35

You said you have CUCM:

My installation is a VG224 (with FXS ports), connected via SIP Trunk to a CUCM.


This Discussion