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dtmf-relay rtp-nte issue

Hello

I am having an issue with 3745 running c3745-spservicesk9-mz.123-11.T7. Indeed DTMF are sent through RFC2833 to the gateway which is configured (dial-peer voip) as follow:

destination-pattern .T

progress_ind setup enable 3

signaling forward rawmsg

session target ipv4:x.x.x.x

incoming called-number .T

dtmf-relay rtp-nte

rtp payload-type nte 101

ip qos dscp cs5 media

no vad

debug voip rtp session named-event shows dtmf are properly sent and received from ISDN and IP as RTP EVT paylod 101 but no dtmf relayed

protocol is H.323 and voice is both ways but no way to exchange dtmf

any idea ?

Best regards

2 REPLIES

Re: dtmf-relay rtp-nte issue

DTMF relay for H323 is handled with 3 commands.

cisco-rtp Cisco Proprietary RTP

h245-alphanumeric DTMF Relay via H245 Alphanumeric IE

h245-signal DTMF Relay via H245 Signal IE

Your best bet is h245-alphanumeric. The dtmf-relay rtp-nte command is used for SIP dial-peers.

The DTMF relay feature transports DTMF tones generated after call establishment out of band using either a standard H.323 out-of-band method and a proprietary RTP-based mechanism, or for SIP calls, an NTE RTP packet.

http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a00800d62d2.shtml#Solution4

Please rate any helpful posts

Thanks

Fred

New Member

Re: dtmf-relay rtp-nte issue

Hello

Thanks for the feedback but NTE RTP packet has been added to H.323 gateway (from 12.2 T)

http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a00800b5e46.html

Ind

Consequently with dtmf-relay rtp-nte when receiving named telephone event, it should generate the tone which is not the case.

Moreover I cannot use h245 and rtp nte is the best solution when call is g.729

Thanks

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