Well, BT require registration via telephone number so I wouldn't have thought it would be possible to send a name.
Below is an example incoming call from my mobile to my incoming DDI on the BT platform (my name and mobile being an entry in the corporate directory - all that shows on my handset is my mobile number but no name):
1574701447mS SIP Call Tx: 150
SIP/2.0 100 Trying
Via: SIP/2.0/UDP 85.119.60.1:5060;branch=z9hG4bK-1b8021-4c62b1aa-1909061e-1700c66d
From: "07825363102" <sip:07825363102@as.hipcom.co.uk>;tag=13c7755-13c4-4c62b1aa-1909061e-b0fe84
To: "Courtenay Mills" <sip:441737228110@comtec.com>;tag=af43507631c62a8e
Call-ID: BW152805689110810294292074@172.20.240.9
CSeq: 1 INVITE
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, INFO, UPDATE
Supported: timer
Content-Length: 0
1574701447mS SIP Tx: UDP 77.73.146.250:5060 -> 85.119.60.1:5060
SIP/2.0 100 Trying
Via: SIP/2.0/UDP 85.119.60.1:5060;branch=z9hG4bK-1b8021-4c62b1aa-1909061e-1700c66d
From: "07825363102" <sip:07825363102@as.hipcom.co.uk>;tag=13c7755-13c4-4c62b1aa-1909061e-b0fe84
To: "Courtenay Mills" <sip:441737228110@comtec.com>;tag=af43507631c62a8e
Call-ID: BW152805689110810294292074@172.20.240.9
CSeq: 1 INVITE
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, INFO, UPDATE
Supported: timer
Content-Length: 0
1574701450mS CMCallEvt: CREATE CALL:11351 (f51371c0)
1574701450mS CMCallEvt: 0.323918.0 -1 BaseEP: NEW CMEndpoint f51313d4 TOTAL NOW=14 CALL_LIST=6
1574701453mS CMLineRx: v=0
CMSetup
Line: type=SIPLine 150 Call: lid=150 id=323917 in=1
Called[210] Type=Default (100) Reason=CMDRdirect SndComp Calling[07825363102@as.hipcom.co.uk] Type=Unknown Plan=Default
BC: CMTC=Speech CMTM=Circuit CMTR=64 CMST=Default CMU1=ALaw
IE CMIERespondingPartyName (228)(Type=CMNameDefault) name=07825363102
IE CMIERespondingPartyNumber (230)(P:100 S:100 T:0 N:100 R:4) number=07825363102@as.hipcom.co.uk
IE CMIEFastStartInfoData (6)
IE CMIEMediaWaitForConnect (16) CMIEMediaWaitForConnect
IE CMIEDIDNumber (245)(P:100 S:100 T:100 N:100 R:4) number=441737228110
IE CMIEDeviceDetail (231) LOCALE=eng HW=14 VER=6 class=CMDeviceSIPTrunk type=0 number=150 channel=0 rx_gain=32 tx_gain=32 ep_callid=323917 ipaddr=77.73.146.250 apps=8
1574701453mS CD: CALL: 150.323917.1 BState=Idle Cut=1 Music=0.0 Aend="Line 150" (0.0) Bend="" [] (0.0) CalledNum=210 () CallingNum=07825363102@as.hipcom.co.uk (07825363102) Internal=0 Time=3 AState=Idle
1574701453mS CMCallEvt: 150.323917.1 11351 SIPTrunk Endpoint: StateChange: END=A CMCSIdle->CMCSDialInitiated
1574701454mS CMTARGET: 150.323917.1 11351 SIPTrunk Endpoint: LOOKUP CALL ROUTE: type=100 called_party=210 sub= calling=07825363102@as.hipcom.co.uk dir=in complete=1 ses=0
1574701454mS CMTARGET: 150.323917.1 11351 SIPTrunk Endpoint: SET BESTMATCH: length 0 vs -1 match= dest=VM:comtec
1574701454mS CMTARGET: 150.323917.1 11351 SIPTrunk Endpoint: SET BESTMATCH: length 12 vs 0 match=441737228110 dest=210
1574701454mS CMCallEvt: Priority hike: call 11351 priority 0->1
1574701455mS CMTARGET: 150.323917.1 11351 SIPTrunk Endpoint: LOOKUP ICR: DDI=441737228110 CGPN=07825363102@as.hipcom.co.uk (Destination 210 ) => CDPN=210
1574701455mS CMTARGET: 150.323917.1 11351 SIPTrunk Endpoint: ADD TARGET (N): number=210 type=100 depth=1 nobar=1 setorig=1 ses=0
1574701455mS CMTARGET: 150.323917.1 11351 SIPTrunk Endpoint: SET USER: CMills orig=1
1574701456mS CMTARGET: 150.323917.1 11351 SIPTrunk Endpoint: ADD USER: CMills depth=2 disallow_cw=0 dnd=0 real_call=1 group_call=0 type(CMNTypeDefault) incl(0x0) excpt(0x0), allow_redir(1) remote=00000000
1574701456mS CMMap: a=4.1 b=0.0 Mapper::AllocateCodec allocated CMRTVocoder resource busy 3, total 64
1574701456mS CMCallEvt: 0.323919.0 -1 BaseEP: NEW CMEndpoint f52053b4 TOTAL NOW=15 CALL_LIST=7
1574701457mS CMCallEvt: 0.323919.0 -1 CMills.-1: NEW CMExtnEndpoint f52053b4, Name=CMills, Extn=210, Phys Extn=405
1574701458mS CMTARGET: 0.323919.0 11351 CMills.0: ADD PRIMARY
1574701458mS CMTARGET: 150.323917.1 11351 SIPTrunk Endpoint: INITIAL TARGETING SUCCEEDED
1574701458mS CMTARGET: 150.323917.1 11351 SIPTrunk Endpoint: GetNoAnswerTimer:15
1574701459mS CMCallEvt: 150.323917.1 11351 SIPTrunk Endpoint: StateChange: END=A CMCSDialInitiated->CMCSDialled
1574701460mS CMLineTx: v=0
CMProceeding
Line: type=SIPLine 150 Call: lid=150 id=323917 in=1
1574701460mS Sip: 150.323917.1 11351 SIPTrunk Endpoint(f50ece74) received CMProceeding
1574701460mS CMCallEvt: 0.323918.0 11351 TargetingEP: StateChange: END=B CMCSIdle->CMCSOffering
1574701461mS CMCallEvt: 0.323919.0 11351 CMills.0: StateChange: END=T CMCSIdle->CMCSOffering
1574701462mS CMExtnEvt: CMills: CMExtnHandler::SetCurrent( id: 0->323919 )
1574701462mS CMExtnTx: v=210, p1=0
CMSetup
Line: type=DigitalExtn 3 Call: lid=0 id=323919 in=0
Called[210] Type=Default (100) Reason=CMDRdirect SndComp Calling[07825363102@as.hipcom.co.uk] Type=Unknown Plan=Default
BC: CMTC=Speech CMTM=Circuit CMTR=64 CMST=Default CMU1=ALaw
IE CMIERespondingPartyName (228)(Type=CMNameDefault) name=07825363102
IE CMIERespondingPartyNumber (230)(P:100 S:100 T:0 N:100 R:4) number=07825363102@as.hipcom.co.uk
IE CMIEMediaWaitForConnect (16) CMIEMediaWaitForConnect
IE CMIEDIDNumber (245)(P:100 S:100 T:100 N:100 R:4) number=441737228110
IE CMIEDeviceDetail (231) LOCALE=eng HW=14 VER=6 class=CMDeviceSIPTrunk type=0 number=150 channel=0 rx_gain=32 tx_gain=32 ep_callid=323917 ipaddr=77.73.146.250 apps=8
IE CMIECalledPartyName (224)(Type=CMNameDefault) name=CMills
IE CMIECalledPartyKName (225)(Type=CMNameDefault) name=Courtenay Mills
IE CMIECallingPartyName (110)(Type=CMNameDefault) name=07825363102
IE CMIEIcrPriorityDetail (239) Priority = 1
IE CMIEMohSourceId (247) MOH Source = 1
Display [07825363102>CMills]
Timed: 11/08/10 15:26
Locale: eng
1574701462mS CMExtnRx: v=210, p1=0
CMAlerting
Line: type=DigitalExtn 3 Call: lid=0 id=323919 in=0
1574701463mS CMCallEvt: 0.323919.0 11351 CMills.0: StateChange: END=T CMCSOffering->CMCSRinging
1574701463mS CMExtnEvt: v=3 State, new=Ringing old=Idle,0,0,CMills
1574701463mS CMCallEvt: 0.323918.0 11351 TargetingEP: StateChange: END=B CMCSOffering->CMCSRinging
1574701464mS CMCallEvt: 150.323917.1 11351 SIPTrunk Endpoint: StateChange: END=A CMCSDialled->CMCSRingBack
1574701465mS CMLineTx: v=0
CMAlerting
Line: type=SIPLine 150 Call: lid=150 id=323917 in=1
IE CMIERespondingPartyName (228)(Type=CMNameDefault) name=CMills
IE CMIERespondingPartyKName (229)(Type=CMNameDefault) name=Courtenay Mills
IE CMIERespondingPartyNumber (230)(P:100 S:100 T:101 N:100 R:4) number=210
IE CMIEDeviceDetail (231) LOCALE=eng HW=14 VER=6 class=CMDeviceStdPhone type=27 number=27 channel=0 rx_gain=32 tx_gain=32 ep_callid=323919 ipaddr=77.73.146.250 apps=8
1574701465mS Sip: 150.323917.1 11351 SIPTrunk Endpoint(f50ece74) received CMAlerting
1574701466mS SIP Call Tx: 150
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP 85.119.60.1:5060;branch=z9hG4bK-1b8021-4c62b1aa-1909061e-1700c66d
From: "07825363102" <sip:07825363102@as.hipcom.co.uk>;tag=13c7755-13c4-4c62b1aa-1909061e-b0fe84
To: "Courtenay Mills" <sip:441737228110@comtec.com>;tag=af43507631c62a8e
Call-ID: BW152805689110810294292074@172.20.240.9
CSeq: 1 INVITE
Contact: "CMills" <sip:%22Courtenay%20Mills%22@77.73.146.250:5060;transport=udp>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, INFO, UPDATE
Supported: timer
Content-Length: 0