Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements
Users might experience few discrepancies in Search results. We are working on this on our side. We apologize for the inconvenience it may have caused.
New Member

Does Cisco Unity 8x support Inband DTMF:

I am sending calls over a SIP Trunk to Unity and using Inband DTMF.  Unity doesn't recognize the tones being sent if we use Inband.  If we use RFC2833 it works fine.   I would use RFC2833 for all but it causes more issues for certain SIP endpoints,  so we use both in our environment.    Does anyone know if Unity supports true Inband DTMF.

Thanks in advance.

1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: Does Cisco Unity 8x support Inband DTMF:

SIP DTMF Digit Transport

Cisco Unity supports DTMF Relay in accordance with RFC 2833. The DTMF  Relay is based on the transmission of Named Telephony Events (NTE) over  the RTP stream. The default RTP payload used for transmission of DTMF is  101. Cisco Unity treats any incoming RTP payload above 90 as a DTMF  event.

DTMF Digit Transport Type
Supported?

RFC 2833

Yes

In-band tones

No



HTH

java

If this helps, please rate

www.cisco.com/go/pdihelpdesk

HTH

java

if this helps, please rate

www.cisco.com/go/pdi
6 REPLIES
Cisco Employee

Re: Does Cisco Unity 8x support Inband DTMF:

SIP DTMF Digit Transport

Cisco Unity supports DTMF Relay in accordance with RFC 2833. The DTMF  Relay is based on the transmission of Named Telephony Events (NTE) over  the RTP stream. The default RTP payload used for transmission of DTMF is  101. Cisco Unity treats any incoming RTP payload above 90 as a DTMF  event.

DTMF Digit Transport Type
Supported?

RFC 2833

Yes

In-band tones

No



HTH

java

If this helps, please rate

www.cisco.com/go/pdihelpdesk

HTH

java

if this helps, please rate

www.cisco.com/go/pdi
New Member

Re: Does Cisco Unity 8x support Inband DTMF:

Thanks for the information.   I couldn't access the link you sent.  Do you have another path?

Cisco Employee

Re: Does Cisco Unity 8x support Inband DTMF:

Whenever that happens just copy the link, remove partner/ and try again.


HTH

java

If this helps, please rate

www.cisco.com/go/pdihelpdesk

HTH

java

if this helps, please rate

www.cisco.com/go/pdi
New Member

Re: Does Cisco Unity 8x support Inband DTMF:

I found it.  Thank you.

New Member

Re: Does Cisco Unity 8x support Inband DTMF:

Sorry,  one other question.  Wouldn't a transcoder be engaged if the dtmf codec isn't supported?  I have HW transcoding resources available but I don't see that they are allocated.

Cisco Employee

Re: Does Cisco Unity 8x support Inband DTMF:

It can be done by MTP or XCODER, if no MTPs are available but there is XCODER it can be used.


HTH

java

If this helps, please rate

www.cisco.com/go/pdihelpdesk

HTH

java

if this helps, please rate

www.cisco.com/go/pdi
709
Views
0
Helpful
6
Replies
CreatePlease to create content