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Cisco Bug: CSCun32587 - T150 - DTMF on the Second Line to BroadWorks or Acatel Devices Fails

Last Modified

Feb 26, 2014

Products (1)

  • Cisco TelePresence System MXP Series

Known Affected Releases


Description (partial)

DTMF from the T150 Does not work as expected on the Second Line to the Thirdy Party SIP Application Server.

Using the "2nd Line" of a T150 to send DTMF to a third part SIP Application Server such as Broadworks or Acatel.

Tested L6.1 Code on the T150

1. Place a Call Outbound to one party SIP or receive one inbound.
2. Place that Call on Hold.
3. Call outbound to the BroadWorks Application Server, which is configured to collect DTMF (RFC 2833)
4. Press the Digits on the T150 you want to send via DTMF.
5. Only the First Digit is Sent.
6. Application Server Times out and sends New Invite to T150 saying the Number Sent is Unknown (because only 1 Digit is sent)
7. T150 Responds with 200 OK
8. Application Server ACKS
9. DTMF Pressed initially is now flooded to the Application Server.
 - In a 2 Second Time Period 9 DTMF Digits are Sent from the T150.
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