Here is a trace of the failure.
14:21:59 617043662mS SIP Rx: UDP 192.168.43.254:5060 -> 192.168.43.1:5060
INVITE sip:617xxxxxxx@192.168.43.1:5060 SIP/2.0
From: "USTELECENTERS" <sip:978xxxxxxx@192.168.43.1:5060;transport=UDP>;tag=7c2edb8-7f000001-13c4-136dd-148bb1e8-136dd
To: <sip:617xxxxxxx@192.168.43.1:5060>
Call-ID: 7ca29f8-7f000001-13c4-136dd-3d024c9f-136dd@192.168.43.1
CSeq: 1 INVITE
Via: SIP/2.0/UDP 192.168.43.254:5060;branch=z9hG4bK-136dd-4be4f87-5679f27b
Max-Forwards: 70
Supported: replaces
Allow: ACK, BYE, CANCEL, INFO, INVITE, NOTIFY, PRACK, REFER, REGISTER, OPTIONS
User-Agent: ADTRAN_NetVanta_3430/R13.9.0.HB.V (S0024454f56f1)
P-Asserted-Identity: "USTELECENTERS" <sip:978xxxxxxx@192.168.43.1>
Contact: <sip:978xxxxxxx@192.168.43.254:5060;transport=UDP>
Content-Type: application/sdp
Content-Length: 261
v=0
o=Sonus_UAC 870522 7268 IN IP4 192.168.43.254
s=SIP Media Capabilities
c=IN IP4 192.168.43.254
t=0 0
m=audio 10044 RTP/AVP 9 0 101
a=sendrecv
a=ptime:20
a=rtpmap:9 G722/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
14:21:59 617043665mS Sip: Association found trunk: SIP Line (17)
14:21:59 617043666mS CMCallEvt: 0000000000000000 0.536874187.0 -1 BaseEP: NEW CMEndpoint f1a81834 TOTAL NOW=3 CALL_LIST=1
14:21:59 617043666mS Sip: SIP Line (17): sip_trunk_config_items 50020101, sip_trunk_config_items_2 00000000, voip.flags 00000949
14:21:59 617043666mS Sip: SIPDialog f1a7fb08 created, dialogs 1 txn_keys 1 video 1 presentation 1 camera 1 unsupp audio 0
14:21:59 617043666mS Sip: 0000000000000000 0.536874187.0 -1 SIPTrunk Endpoint(f1a7fb08) SetUnIntTransactionCondition to UnInt_None
14:21:59 617043667mS Sip: SIP Line (17): License, Valid 1, Available 25, Consumed 0
14:21:59 617043668mS Sip: SIPTrunkEndpointDialogOwner::SetRemoteAddressForRequest from 192.168.43.254:5060 to 192.168.43.254:5060
14:21:59 617043668mS Sip: FindContactParameters mFarDisplayString <USTELECENTERS> mFarDisplayNumber <978xxxxxxx> restricted 0
14:21:59 617043669mS Sip: 0a00001320000ccb 17.536874187.1 -1 SIPTrunk Endpoint(f1a7fb08) Cloned
14:21:59 617043669mS Sip: SIPDialog::ExtractResponseParamsFromViaHeader remote sent_by: 192.168.43.254:5060 trunk
14:21:59 617043669mS Sip: SIPDialog::ExtractResponseParamsFromViaHeader remote sent by transport: SIP/2.0/UDP trunk
14:21:59 617043669mS Sip: SIPTrunkEndpointDialogOwner::SetRemoteAddressForResponse from 192.168.43.254:5060 to 192.168.43.254:5060
14:21:59 617043670mS Sip: 0a00001320000ccb 17.536874187.1 -1 SIPTrunk Endpoint(f1a7fb08) SendSIPResponse: INVITE code 100 SENT TO 192.168.43.254 5060
14:21:59 617043670mS SIP Tx: UDP 192.168.43.1:5060 -> 192.168.43.254:5060
SIP/2.0 100 Trying
Via: SIP/2.0/UDP 192.168.43.254:5060;branch=z9hG4bK-136dd-4be4f87-5679f27b
From: "USTELECENTERS" <sip:978xxxxxxx@192.168.43.1:5060;transport=UDP>;tag=7c2edb8-7f000001-13c4-136dd-148bb1e8-136dd
Call-ID: 7ca29f8-7f000001-13c4-136dd-3d024c9f-136dd@192.168.43.1
CSeq: 1 INVITE
Allow: INVITE,ACK,CANCEL,OPTIONS,BYE,INFO,REFER,NOTIFY,UPDATE
Supported: timer
Server: IP Office 11.1.2.2.0 build 20
To: <sip:617xxxxxxx@192.168.43.1:5060>;tag=07668fefe1b2097d
Content-Length: 0
14:21:59 617043671mS Sip: 0a00001320000ccb 17.536874187.1 -1 SIPTrunk Endpoint(f1a7fb08) INVITE Received ep 0a00001320000ccb 17.536874187.1 -1 SIPTrunk Endpoint(f1a81834), dialog f1a7fb08
14:21:59 617043671mS Sip: 0a00001320000ccb 17.536874187.1 -1 SIPTrunk Endpoint(f1a7fb08) UpdateSIPCallState SIPDialog::INITIAL(0) -> SIPDialog::INVITE_RCVD(9)
14:21:59 617043672mS Sip: 0a00001320000ccb 17.536874187.1 -1 SIPTrunk Endpoint(f1a7fb08) UpdateSDPState SIPDialog::IDLE(0) -> SIPDialog::OFFER_RCVD(2)
14:21:59 617043672mS Sip: 0a00001320000ccb 17.536874187.1 -1 SIPTrunk Endpoint(f1a7fb08) SdpClone
14:21:59 617043672mS Sip: 0a00001320000ccb 17.536874187.1 -1 SIPTrunk Endpoint(f1a7fb08) SIPDialog::BuildFastStartFromSDPOffer sdpmsg f1a7d690
14:21:59 617043672mS Sip: 0a00001320000ccb 17.536874187.1 -1 SIPTrunk Endpoint(f1a7fb08) SIPDialog::FindConnectionParameters: found media proto <RTP/AVP>
14:21:59 617043673mS Sip: 0a00001320000ccb 17.536874187.1 -1 SIPTrunk Endpoint(f1a7fb08) BuildFastStartFromSDPOffer: known_stream 1 media_type 0 stream_type 6 allow_stream 1
14:21:59 617043673mS Sip: 0a00001320000ccb 17.536874187.1 -1 SIPTrunk Endpoint(f1a7fb08) SIPDialog::BuildFastStartFromAudioMediaSDPOffer reinvite 0 mRTP_PType 255 prefer_existing_codec 0
14:21:59 617043673mS Sip: 0a00001320000ccb 17.536874187.1 -1 SIPTrunk Endpoint(f1a7fb08) HandleSDPContext: found_rfc2833 with payload 101
14:21:59 617043673mS Sip: 0a00001320000ccb 17.536874187.1 -1 SIPTrunk Endpoint(f1a7fb08) SetRfc2833TxPayload: use RFC2833 for dtmf
14:21:59 617043673mS Sip: 0a00001320000ccb 17.536874187.1 -1 SIPTrunk Endpoint(f1a7fb08) SetRfc2833TxPayload: payload 101 set_rx 1
14:21:59 617043674mS Sip: 0a00001320000ccb 17.536874187.1 -1 SIPTrunk Endpoint(f1a7fb08) Process SIP request dialog f1a7fb08, method INVITE in state SIPDialog::INVITE_RCVD(9)
14:21:59 617043675mS Sip: 0a00001320000ccb 17.536874187.1 -1 SIPTrunk Endpoint(f1a7fb08) UpdateClone mMesg f1a7bb8c smsg f58bd8b8
14:21:59 617043675mS Sip: 0a00001320000ccb 17.536874187.1 -1 SIPTrunk Endpoint(f1a7fb08) CMSetup forwarded to call model owner_ep 0a00001320000ccb 17.536874187.1 -1 SIPTrunk Endpoint(f1a81834), dialog f1a7fb08 has sdp 1
14:21:59 617043675mS CMCallEvt: CREATE CALL:562 (f1ab0304)
14:21:59 617043676mS CMCallEvt: 0000000000000000 0.536874188.0 -1 BaseEP: NEW CMEndpoint f1abced0 TOTAL NOW=4 CALL_LIST=1
14:21:59 617043679mS CMLineRx: v=0
CMSetup
Line: type=SIPLine 17 Call: lid=17 id=536874187 in=1
Called[617xxxxxxx] Type=Default (100) Reason=CMDRdirect SndComp Calling[978xxxxxxx@192.168.43.1] Type=Unknown Plan=Default
BC: CMTC=Speech CMTM=CallIndSigCon CMTR=64 CMST=Default CMU1=ULaw
IE CMIEFastStartInfoData (6) 2 item(s)
IE CMIECallingPartyName (110)(Type=CMNameDefault) name=USTELECENTERS
IE CMIERespondingPartyName (228)(Type=CMNameDefault) name=USTELECENTERS
IE CMIERespondingPartyNumber (230)(P:100 S:100 T:0 N:100 R:4) number=978xxxxxxx@192.168.43.1
IE CMIEDeviceDetail (231) 0a00001320000ccb LOCALE=enu HW=15 VER=11 class=CMDeviceSIPTrunk type=0 number=17 channel=1 features=0x0 rx_gain=32 tx_gain=32
ep_callid=536874187 ipaddr=10.0.0.19 apps=0 loc=999 em_a_loc=999 em_d_loc=0 features2=0x0 is_spcall=1 ignores_dtmf=0
avgsid=<>
14:21:59 617043679mS CMCallEvt: 0a00001320000ccb 17.536874187.1 562 SIPTrunk Endpoint: StateChange: END=A CMCSIdle->CMCSDialInitiated
14:21:59 617043679mS CMTARGET: 0a00001320000ccb 17.536874187.1 562 SIPTrunk Endpoint: LOOKUP CALL ROUTE: GID=17 type=100 called_party=617xxxxxxx sub= calling=978xxxxxxx@192.168.43.1 calling_sub= dir=in complete=1 ses=0
14:21:59 617043680mS CMTARGET: 0a00001320000ccb 17.536874187.1 562 SIPTrunk Endpoint: SET BESTMATCH: length 0 vs -1 match= dest=VM:SomersetAA climatch -1 vs -1
14:21:59 617043680mS CMTARGET: 0a00001320000ccb 17.536874187.1 562 SIPTrunk Endpoint: SET BESTMATCH: length 10 vs 0 match=617xxxxxxx dest=VM:SomersetAA climatch -1 vs -1
14:21:59 617043680mS CMCallEvt: Priority hike: call 562 priority 0->1
14:21:59 617043680mS CMTARGET: 0a00001320000ccb 17.536874187.1 562 SIPTrunk Endpoint: LOOKUP ICR: DDI=617xxxxxxx CGPN=978xxxxxxx@192.168.43.1 (Destination VM:SomersetAA CLI ) => CDPN=VM:SomersetAA
14:21:59 617043680mS CMTARGET: 0a00001320000ccb 17.536874187.1 562 SIPTrunk Endpoint: ADD TARGET (N): number=VM:SomersetAA type=100 depth=1 nobar=1 setorig=1 ses=0
14:21:59 617043680mS CMTARGET: 0a00001320000ccb 17.536874187.1 562 SIPTrunk Endpoint: ADD VM TARGET
14:21:59 617043681mS CMTARGET: 0a00001320000ccb 17.536874187.1 562 SIPTrunk Endpoint: MakeVoicemailTarget pbx=<null> local=1 type=1
14:21:59 617043681mS CMMap: Mapper::AllocateCodec unable to allocate resource
14:21:59 617043681mS CMCallEvt: Cannot reserve a codec for Aend, aend is 0a00001320000ccb 17.536874187.1 562 SIPTrunk Endpoint
14:21:59 617043681mS CMTARGET: NULL: ADD PRIMARY
14:21:59 617043681mS CMTARGET: 0a00001320000ccb 17.536874187.1 562 SIPTrunk Endpoint: ADD VM TARGET: FAILED availability=2
14:21:59 617043681mS CMTARGET: 0a00001320000ccb 17.536874187.1 562 SIPTrunk Endpoint: NO INITIAL TARGETS: ??
14:21:59 617043681mS CMTARGET: 0a00001320000ccb 17.536874187.1 562 SIPTrunk Endpoint: Fallback() targeting failed
14:21:59 617043683mS CMLOGGING: CALL:2022/09/0714:21,00:00:00,000,978xxxxxxx@192.168.43.1,I,SomersetAA,617xxxxxxx,USTELECENTERS,,,0,,"",0,n/a
14:21:59 617043684mS CMLineTx: v=0
CMReleaseComp
Line: type=SIPLine 17 Call: lid=17 id=536874187 in=1
Cause=34, No cct/chan available
14:21:59 617043684mS Sip: 0a00001320000ccb 17.536874187.1 -1 SIPTrunk Endpoint(f1a81834) received CMReleaseComp
14:21:59 617043684mS Sip: 0a00001320000ccb 17.536874187.1 -1 SIPTrunk Endpoint(f1a7fb08) Terminating dialog f1a7fb08, state SIPDialog::INVITE_RCVD(9) for cause CMCauseNoChannel
14:21:59 617043684mS Sip: SIPDialog::ExtractResponseParamsFromViaHeader remote sent_by: 192.168.43.254:5060 trunk
14:21:59 617043684mS Sip: SIPDialog::ExtractResponseParamsFromViaHeader remote sent by transport: SIP/2.0/UDP trunk
14:21:59 617043684mS Sip: SIPTrunkEndpointDialogOwner::SetRemoteAddressForResponse from 192.168.43.254:5060 to 192.168.43.254:5060
14:21:59 617043685mS Sip: 0a00001320000ccb 17.536874187.1 -1 SIPTrunk Endpoint(f1a7fb08) SendSIPResponse: INVITE code 480 SENT TO 192.168.43.254 5060
14:21:59 617043686mS SIP Tx: UDP 192.168.43.1:5060 -> 192.168.43.254:5060
SIP/2.0 480 Temporarily Unavailable
Via: SIP/2.0/UDP 192.168.43.254:5060;branch=z9hG4bK-136dd-4be4f87-5679f27b
From: "USTELECENTERS" <sip:978xxxxxxx@192.168.43.1:5060;transport=UDP>;tag=7c2edb8-7f000001-13c4-136dd-148bb1e8-136dd
Call-ID: 7ca29f8-7f000001-13c4-136dd-3d024c9f-136dd@192.168.43.1
CSeq: 1 INVITE
Allow: INVITE,ACK,CANCEL,OPTIONS,BYE,INFO,REFER,NOTIFY,UPDATE
Supported: timer
Server: IP Office 11.1.2.2.0 build 20
Reason: Q.850;cause=34;text="No circuit/channel available"
To: <sip:617xxxxxxx@192.168.43.1:5060>;tag=07668fefe1b2097d
Content-Length: 0