CUCM 7.1.4, H323 -> SIP, DTMF

[Utair Corporation]

Hi.Having trouble with DTMF signalling.

Remote site1 (CME) dials outide number of remote site2 through CUCM.

Site1 - (h323) - CUCM - (sip) - Site2 - (sip) - PSTN

Call connects with RemoteMediaIPAddress at site2.

SIP TRUNK Site2 uses RFC2833 DTMF setting.

H323 dial-peer to CUCM at site1 has h245-alphanumeric DTMF setting.

how do i make DTMF working?

[Utair Corporation]

After some invesigation i found what CUCM fails to assign MTP for this calls. I have set up MTP on CUCM itselft and assigned it to Media Resource Group List and assigned that list to both device pools this trunks are assigned.

How do i troubleshoot MTP selection and assignment?

[Utair Corporation]

Alright, tracing further revealed this: No matching caps for either side A or side B, MTP not allocated

Any thoughts how to fix this?

waiting_AllocateMtpResourceReq - (capCount,region),A(0,Syctivcar),B(1,Surgut), reqDevCap=0x9, supDevCap=0xb, passthru=0, resourceCount=1
getResourcesAllocated -- DeviceName=MTP_2 Ci=17931096 ResourceCount=1
getResourcesAllocated -- Logging RegionA=Syctivcar Caps and MTP/XCoder Region=Tymen_Plehanovo Caps
logCapabilitiesinTrace -- MTP/XCoder Device Caps = 25 4 2 257 259
logCapabilitiesinTrace -- Device Caps =
getResourcesAllocated -- Logging RegionB=Surgut Caps and MTP/XCoder Region=Tymen_Plehanovo Caps
logCapabilitiesinTrace -- MTP/XCoder Device Caps = 25 4 2 257 259
logCapabilitiesinTrace -- Device Caps = 4
getResourcesAllocated -- No matching caps for either side A or side B, MTP not allocated
getResourcesAllocated -- match1=1 match2=0
getResourcesAllocated -- allocateErrBitset=0x40
SendMTPResourceErrToSender - ERROR  AllocateMtpResourceReq failed -- Ci=17931096, errBitset=0x44
waiting_AllocateMtpResourceReq - (capCount,region),A(0,Syctivcar),B(1,Surgut), reqDevCap=0x9, supDevCap=0x10b, passthru=0, resourceCount=1
getResourcesAllocated -- DeviceName=TRANSSURGUT Ci=17931096 ResourceCount=1
getResourcesAllocated -- Logging RegionA=Syctivcar Caps and MTP/XCoder Region=Surgut Caps
logCapabilitiesinTrace -- MTP/XCoder Device Caps = 4 2 15 16 11 12 257 259 261 222
logCapabilitiesinTrace -- Device Caps =
getResourcesAllocated -- Logging RegionB=Surgut Caps and MTP/XCoder Region=Surgut Caps
logCapabilitiesinTrace -- MTP/XCoder Device Caps = 4 2 15 16 11 12 257 259 261 222
logCapabilitiesinTrace -- Device Caps = 4
getResourcesAllocated -- No matching caps for either side A or side B, MTP not allocated
getResourcesAllocated -- match1=1 match2=0
getResourcesAllocated -- allocateErrBitset=0x40
SendMTPResourceErrToSender - ERROR  AllocateMtpResourceReq failed -- Ci=17931096, errBitset=0x44
waiting_AllocateMtpResourceReq - (capCount,region),A(0,Syctivcar),B(1,Surgut), reqDevCap=0x9, supDevCap=0x10b, passthru=0, resourceCount=1
getResourcesAllocated -- DeviceName=TRANSTMN Ci=17931096 ResourceCount=1
getResourcesAllocated -- Logging RegionA=Syctivcar Caps and MTP/XCoder Region=Tymen_Plehanovo Caps
logCapabilitiesinTrace -- MTP/XCoder Device Caps = 4 2 15 11 257 259 261
logCapabilitiesinTrace -- Device Caps =
getResourcesAllocated -- Logging RegionB=Surgut Caps and MTP/XCoder Region=Tymen_Plehanovo Caps
logCapabilitiesinTrace -- MTP/XCoder Device Caps = 4 2 15 11 257 259 261
logCapabilitiesinTrace -- Device Caps = 4
getResourcesAllocated -- No matching caps for either side A or side B, MTP not allocated
getResourcesAllocated -- match1=1 match2=0
getResourcesAllocated -- allocateErrBitset=0x40
SendMTPResourceErrToSender - ERROR  AllocateMtpResourceReq failed -- Ci=17931096, errBitset=0x44

[Utair Corporation]

It appears what regionA device lacks some capability. It is Cisco 3845 Router with CME.

getResourcesAllocated -- Logging RegionA=Syctivcar Caps and MTP/XCoder Region=Tymen_Plehanovo Caps
logCapabilitiesinTrace -- MTP/XCoder Device Caps = 25 4 2 257 259
logCapabilitiesinTrace -- Device Caps =

Dial-peer settings:

dial-peer voice 362 voip
  description CUCM-01
  translation-profile outgoing 362
  preference 1
  destination-pattern 7.T
  voice-class codec 752
  session target ipv4:10.96.36.2
  dtmf-relay h245-alphanumeric
  fax-relay ecm disable
  fax-relay sg3-to-g3
  fax rate 9600
  fax protocol t38 ls-redundancy 0 hs-redundancy 0 fallback cisco
  fax protocol t38
  ip qos dscp cs5 media
  ip qos dscp cs5 signaling
  no vad

[tkrisher193]

Hello Utair,

Where you able to find a resolution? I am experiencing similar issue in my UCCE environment.

Best regards,

Troy

[Utair Corporation]

Yes, with help of support engineer. Problem was with incorrect "dtmf-relay" dial-peer settting.

Many things have changed over time, can't find details. Sorry.