[cisco-voip] Cisco IOS Enhanced Software Media Termination Point, DTMF and SIP

[Keith Klevenski]

All,

Trying to get DTMF to pass to an Asterisk VM server from the PSTN with no love.  Using H323 PSTN gateways running 12.4(24)T1, ISDN PRI's, CUCM 7.02, with a SIP trunk to Asterisk.  This is all g729 as well.  I can dial into Asterisk internally and DTMF works fine, but I can't get it to pass DTMF from the PSTN.  The call goes though to Asterisk fine from the PSTN, but doesn't seem to be passing DTMF.

sccp ccm group 1
 associate ccm 1 priority 1
 associate ccm 2 priority 2
 associate profile 1 register softmtp2
!
dspfarm profile 1 mtp
 codec g711ulaw
 maximum sessions software 50
 associate application SCCP

sh sccp

SCCP Admin State: UP
Gateway Local Interface: GigabitEthernet0/0.101
        IPv4 Address: 10.1.101.3
        Port Number: 2000
IP Precedence: 5
User Masked Codec list: None
Call Manager: 10.1.101.11, Port Number: 2000
                Priority: 1, Version: 7.0, Identifier: 1
Call Manager: 10.1.101.10, Port Number: 2000
                Priority: 2, Version: 7.0, Identifier: 2

MTP Oper State: ACTIVE - Cause Code: NONE
Active Call Manager: 10.1.101.11, Port Number: 2000
TCP Link Status: CONNECTED, Profile Identifier: 1
Reported Max Streams: 100, Reported Max OOS Streams: 0
Supported Codec: g711ulaw, Maximum Packetization Period: 30
Supported Codec: rfc2833 dtmf, Maximum Packetization Period: 30
Supported Codec: rfc2833 pass-thru, Maximum Packetization Period: 30
Supported Codec: inband-dtmf to rfc2833 conversion, Maximum Packetization Period: 30

>From what I understand the IOS software MTP should be what I need to allow RFC2833 and h245-signal (tried h245-alphanumeric as well) to communicate, even with g729.  The IOS SW MTP is registered and configured, but DTMF is still not being passed.  The IOS software MTP is in the MRG/MRGL for all device pools for all devices.  I've even put all the other media resources in a temp MRG to ensure only the software MTP is able to be invoked (it's all g729 satellite sccp analog phones so no moh/annunciator or anything).  I do a 'deb sccp packet' on the gateway with the IOS MTP, but I get nothing when sending DTMF.  In RTM I don't see any MTP resources being used on the IOS MTP.  I've had the SIP trunk configured with MTP required checked and unchecked (although CM should still dynamically allocate and MTP for DTMF if needed even if it is not checked), RFC2833 set as the DTMF type and G729/G729a as the codec on the trunk.  It seems like the MTP is not being invoked at all, but I'm not sure why or how to absolutely prove that it is or isn't.  So far I don't see any attempts being made to invoke it by looking at RTM or 'deb sccp packet'. I don't have access to the Asterisk box (and wouldn't know what to do if I did), but it works fine internally so I'm pretty sure the problem is with two DTFM types needing an MTP.

Any suggestions or insight?

Thanks!

Keith



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