DTMF in SIP Trunk problem

Hello

I have a problem in case of detection of the DTMF

We have a SIP of the ITSP Trunk and everything is ok except DTMF.

The sip trunk is between ITSP and router 3945

ITSP <->3945 <->CUCM 10.5

I have try all method such as rtp - nte, h245 alphanumeric and h245-signal, info-sip, sip-kpml,... in line-peer to ITSPs

ITSP say that he send with standard RFC2833 dtmf (it equals to rtp-net, I know), but when I am 'debug ccsip message', the results show the dtmf with rfc2833 sends us

16 August 13:52:28.991: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:
Received:
INVITE sip: [email protected] / * /: 5060. user = phone SIP/2.0
Via: SIP/2.0/UDP 10.105.40.34:5060; branch = z9hG4bKejhh8jixkobhnb7ykvi87vuj8
Call ID: [email protected]/ * /.
From: sip: [email protected] / * />; tag = c3cx3vcw-CC-40
To: sip: [email protected] / * /; user = phone >
CSeq: 1 INVITE
Allow: INVITE, ACK, OPTIONS, BYE, CANCEL, REGISTRY, PRACK, INFO SUBSCRIBE, NOTIFY, updates, MESSAGE, see
Max-Forwards: 69
Supported: 100rel, timer
User-Agent: Huawei SoftX3000 V300R010
Session time-out: 300
Min - SE: 90
Contact: sip: [email protected] / * /: 5060; user = phone >
Content-Length: 374
Content-Type: application/sdp
v = 0
o = HuaweiSoftX3000 11042757 11042757 IN IP4 10.105.40.34
s = call Sip
c = IN IP4 10.105.40.34
t = 0 0
m = audio 27762 RTP / AVP 8 0 18 4 2 98 99 102
a = rtpmap:8 PCMA/8000
a = rtpmap:0 PCMU/8000
a G729/8000 rtpmap:18 =
a = rtpmap:4 G723/8000
a = rtpmap:2 G726-32/8000
a = rtpmap:98 G726-40/8000
a = rtpmap:99 G726-32/8000
a = rtpmap:102 G726-24/8000
a = ptime:20
a = fmtp:18 annex b = No.
It is a message to guest (with sdp) of ITSP
As you can see the line with red color must have a code with number of 101 but rather a code with number of 18
In my "ccsip media debug' output show that the method of negotiation between me and itsp 'incoming voice. '
It's my router config:
voip phone service
No IP trust to authenticate
allow connections h323 to SIP
allow connections sip h323
allow sip to sip connections
SIP
interface FastEthernet0/0/1 source control binding
bind media source interface FastEthernet0/0/1
min - to 300 session expires-300
!

Dial-peer voice 2 voip---> router CUCM and vice versa
translation-profile outgoing toos
destination-model 42584...
session protocol sipv2
session target ipv4:10.20.30.70
Codec g711ulaw
DTMF-relay rtp - nte
!
VoIP voice 10 Dial - peer---> router for ITSP and vice versa
destination-model. T
session protocol sipv2
session target ipv4:10.105.40.34
incoming called-number. T
DTMF-relay rtp - nte
Codec g711ulaw
I have configured cucm with a sip section to my favorite router with active PSG and RFC2833
BUT HE DIDN'T THERE WAS NO DETECTION OF DTMF IN INCOMING CALLS AND OUTGOING
I even test dial-position 10 without any method of dtmf-relay because I want to configure it with the incoming voice method, but it does not work
I change the codec but does not solve the problem
There is an interesting point and that is, if use Elastix 3945 of the router and configure dtmf among elastix and itsp as "inbound" method and method dtmf among elastix and cucm as 'rfc2833' everything is OK (ITSP<--Inbound--> Elastix <--rfc2833-->CUCM)
Please give me a solution to solve the problem between Cisco 3945 and ITSP
Concerning

It would be more accurate to say that the problem has been bypassed by using a transcoding resource. The correct resolution here would be to open a ticket to trouble with the ITSP. I agree that the PROMPT message you show doesn't include advertising RFC2833 in the SDP offer. It is a problem that only the carrier can rectify.

Tags: Cisco Support

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