Webex Calling

Webex Calling has a Dual identity support configuration at the SIP trunk level - which you can disable. By the default it is enabled as the configuration states the followins:

The Dual Identity Support setting impacts the handling of the From header and P-Asserted-Identity (PAI) header when sending an initial SIP INVITE to the trunk for an outbound call. When enabled, the From and PAI headers are treated independently and may differ. When disabled, the PAI header is set to the same value as the From header. Please refer to the documentation for more details.

However when this is set - and you make an outbound call on WxCC - the PAI header is set to the default ANI of the Tenant, while the FROM header is set to the Outdial ANI.

The CUBE will then remap the PAI header to be the From header. And the PAI header is what the caller seeing as the calling number.

i.e. if you look at the following two headers in the SIP invite they contain different numbers. The default Tenant ANI is set in the PAI header.

..
From:"Entry Point - Global - Not In Servic"<sip:[email protected];user=phone>;tag=226606826-1684842712708-
..
P-Asserted-Identity:"eirsupport1"<sip:[email protected];user=phone>
..

by disabling the Dual Identity Support option on Webex Calling, the From and PAI header are both set to the ANI as configured in the Outdial ANI

This setting is found on the Webex Control Hub Webex Calling Trunk Setting:
Calling → Call Routing → Trunk → <the InUse trunk> → Manage

  • Settings → General → Landing Screen → Calling
  • Settings → Calling → Incoming Calls → Uncheck 'Answer calls with my video on'
  • Settings → Calling → Call window settings → 'When using this computer for calls' → Auto-minimise calls

Even if you enable and configure a user successfully for voicemail on Webex Calling, it will not work until the voicemail phone number is configured in the relevant location.

Go to Location - > Calling → Calling Features Setting → Voice Portal And then configure the extension for voicemail (I typically use 8000 as per below).

e.g. bulk configure user Webex Calling settings. Reference: https://help.webex.com/en-us/article/ijda3o/Manage-user-calling-data

Example of what you can export (and then edit and upload).

Webex Calling Registered Trunks

When you setup a SIP trunk with Wx Calling - it gives you details such as below (as well as username / password).

Trunk type: Registration based Device: Cisco CUBE Local Gateway Registrar Domain: eun10.bcld.webex.com Trunk Group OTG/DTG: vcube-test_12345678_lgu Line/Port: [email protected] Outbound Proxy Address: ams03.sipconnect-eun.bcld.webex.com

The Local gateway uses a SIP SRV record using the Outbound proxy address to find on where to connect. Below is an example on doing a TCP Secure SIP SRV record direct from the windows command console for the ams03.sipconnect-eun.bcld.webex.com

C:\Users\user1>nslookup -type=SRV _sips._tcp.ams03.sipconnect-eun.bcld.webex.com
Server:  dns.mydomain.com
Address:  10.100.1.100

Non-authoritative answer:
_sips._tcp.ams03.sipconnect-eun.bcld.webex.com  SRV service location:
          priority       = 500
          weight         = 50
          port           = 8934
          svr hostname   = sse9.public.wamswxc-p-2.prod.infra.webex.com
_sips._tcp.ams03.sipconnect-eun.bcld.webex.com  SRV service location:
          priority       = 10
          weight         = 50
          port           = 8934
          svr hostname   = sse6.public.wfrawxc-p-3.prod.infra.webex.com

We can then find out details on the certs used by these endpoints using openssl

openssl s_client -connect sse9.public.wamswxc-p-2.prod.infra.webex.com:8934 -showcerts

Which will return the below:

Connecting to 170.72.29.162
CONNECTED(00000204)
depth=2 C=US, O=IdenTrust, CN=IdenTrust Commercial Root CA 1
verify error:num=19:self-signed certificate in certificate chain
verify return:1
depth=2 C=US, O=IdenTrust, CN=IdenTrust Commercial Root CA 1
verify return:1
depth=1 C=US, O=IdenTrust, OU=HydrantID Trusted Certificate Service, CN=HydrantID Server CA O1
verify return:1
depth=0 C=US, ST=California, L=San Jose, O=Cisco Systems Inc., CN=sse0.public.wamswxc-p-2.prod.infra.webex.com
verify return:1
---
Certificate chain
 0 s:C=US, ST=California, L=San Jose, O=Cisco Systems Inc., CN=sse0.public.wamswxc-p-2.prod.infra.webex.com
   i:C=US, O=IdenTrust, OU=HydrantID Trusted Certificate Service, CN=HydrantID Server CA O1
   a:PKEY: RSA, 2048 (bit); sigalg: sha256WithRSAEncryption
   v:NotBefore: Apr 21 20:21:47 2026 GMT; NotAfter: Nov  6 20:20:47 2026 GMT
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-----END CERTIFICATE-----
 1 s:C=US, O=IdenTrust, OU=HydrantID Trusted Certificate Service, CN=HydrantID Server CA O1
   i:C=US, O=IdenTrust, CN=IdenTrust Commercial Root CA 1
   a:PKEY: RSA, 2048 (bit); sigalg: sha256WithRSAEncryption
   v:NotBefore: Dec 12 16:56:15 2019 GMT; NotAfter: Dec 12 16:56:15 2029 GMT
-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----
 2 s:C=US, O=IdenTrust, CN=IdenTrust Commercial Root CA 1
   i:C=US, O=IdenTrust, CN=IdenTrust Commercial Root CA 1
   a:PKEY: RSA, 4096 (bit); sigalg: sha256WithRSAEncryption
   v:NotBefore: Jan 16 18:12:23 2014 GMT; NotAfter: Jan 16 18:12:23 2034 GMT
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4iZZRHUe2XWJUc0QhJ1hYMtd+ZciTY6Y5uN/9lu7rs3KSoFrXgvzUeF0K+l+J6fZ
mUlO+KWA2yUPHGNiiskzZ2s8EIPGrd6ozRaOjfAHN3Gf8qv8QfXBi+wAN10J5U6A
7/qxXDgGpRtK4dw4LTzcqx+QGtVKnO7RcGzM7vRX+Bi6hG6H
-----END CERTIFICATE-----
---
Server certificate
subject=C=US, ST=California, L=San Jose, O=Cisco Systems Inc., CN=sse0.public.wamswxc-p-2.prod.infra.webex.com
issuer=C=US, O=IdenTrust, OU=HydrantID Trusted Certificate Service, CN=HydrantID Server CA O1
---
No client certificate CA names sent
Peer signing digest: SHA256
Peer signature type: rsa_pss_rsae_sha256
Peer Temp Key: X25519, 253 bits
---
SSL handshake has read 7021 bytes and written 1655 bytes
Verification error: self-signed certificate in certificate chain
---
New, TLSv1.3, Cipher is TLS_AES_256_GCM_SHA384
Protocol: TLSv1.3
Server public key is 2048 bit
This TLS version forbids renegotiation.
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
Verify return code: 19 (self-signed certificate in certificate chain)
---
---
Post-Handshake New Session Ticket arrived:
SSL-Session:
    Protocol  : TLSv1.3
    Cipher    : TLS_AES_256_GCM_SHA384
    Session-ID: 0484E102B2766B8F40BF66C10F66B26788D2CE5C4C948714DFCCF306330CB6E7
    Session-ID-ctx:
    Resumption PSK: E832D1728B189D8C6F0D6510B01BA48FEC2BE13045F6164F235309FD4A6D1925335807E655C255A003077A581F80BD11
    PSK identity: None
    PSK identity hint: None
    SRP username: None
    TLS session ticket lifetime hint: 14400 (seconds)
    TLS session ticket:
    0000 - 60 e2 32 0f 41 b3 49 52-70 8f a3 23 a4 1d 2a 55   `.2.A.IRp..#..*U
    0010 - 0f 42 4c 4e e4 82 b1 dc-29 74 83 4e b0 89 6c cb   .BLN....)t.N..l.
    0020 - 74 88 3b 85 95 7a 72 24-f3 4a f2 1c dd 34 42 c0   t.;..zr$.J...4B.
    0030 - e4 c8 f4 e5 f6 7c 09 43-f9 d8 f5 af f4 1d 80 8b   .....|.C........
    0040 - 99 48 6e 7b cb a1 7d 17-4d 7e e4 e8 98 c9 7d fb   .Hn{..}.M~....}.
    0050 - 41 0e 62 6e 43 52 67 d4-13 99 19 ab 0a 32 9c ca   A.bnCRg......2..
    0060 - 0b ec 86 cb ed 76 33 d0-3c 2c 17 19 e2 f2 81 b2   .....v3.<,......
    0070 - ed ed d3 b2 2e 10 cd 6a-35 60 a5 e7 df b3 df 84   .......j5`......
    0080 - d1 24 4a 1c 8d a7 87 68-1f c8 c4 4a 36 8f 3d 67   .$J....h...J6.=g
    0090 - b7 dd 6b ca 83 60 47 a6-68 78 17 af ec ea b3 ac   ..k..`G.hx......
    00a0 - e4 67 79 38 52 e3 e3 27-7d bc e5 02 fa 88 73 56   .gy8R..'}.....sV
    00b0 - 71 17 c4 08 d1 31 92 00-85 fa ca 7b 82 01 31 df   q....1.....{..1.
    00c0 - 06 97 f8 b5 98 c2 8c ff-1d c9 80 e3 70 9f 1c 69   ............p..i
    00d0 - 40 08 3b 3f a5 81 02 9a-5d 96 a8 53 8a 4b ff 72   @.;?....]..S.K.r
    00e0 - d3 a9 97 e1 b5 da 10 b2-b8 c4 0e 79 16 c4 3c 48   ...........y..<H
    00f0 - 03 79 d7 ae 56 ba 4e 5d-1b 98 cb f1 5d 89 84 84   .y..V.N]....]...

    Start Time: 1779979538
    Timeout   : 7200 (sec)
    Verify return code: 19 (self-signed certificate in certificate chain)
    Extended master secret: no
    Max Early Data: 0
---
read R BLOCK
---
Post-Handshake New Session Ticket arrived:
SSL-Session:
    Protocol  : TLSv1.3
    Cipher    : TLS_AES_256_GCM_SHA384
    Session-ID: FD3C184AA4D5866A07B14E5FB824CE2BCD1EDAC58FA3B1ACAF5B28830E7A48ED
    Session-ID-ctx:
    Resumption PSK: 6F4FD627ADF745C7382856EB7A27727C3D3B439BF86218D1325DB3A96D9BEA29190E2E6B49BC25FC8DDE1AD6B39EAB9E
    PSK identity: None
    PSK identity hint: None
    SRP username: None
    TLS session ticket lifetime hint: 14400 (seconds)
    TLS session ticket:
    0000 - 60 e2 32 0f 41 b3 49 52-70 8f a3 23 a4 1d 2a 55   `.2.A.IRp..#..*U
    0010 - e1 2d 06 d6 92 bf b1 5f-71 59 7e a5 19 40 e0 28   .-....._qY~..@.(
    0020 - 15 59 2b 81 73 47 40 6c-db 08 4b 37 46 34 2f 3a   [email protected]/:
    0030 - ff 8e 89 a0 eb 7a 17 9d-b5 7d a4 61 61 f0 a9 89   .....z...}.aa...
    0040 - f2 f7 d0 c1 3a 6d f3 65-42 10 d7 4f 2f 49 2d 76   ....:m.eB..O/I-v
    0050 - 6b bc 96 00 50 97 cb a6-0f c7 2f 26 2e f0 a9 ac   k...P...../&....
    0060 - 3d b2 2b 3f 7e 77 ff 7c-3d df a4 e8 e2 a6 6d 2e   =.+?~w.|=.....m.
    0070 - a2 a2 28 b9 18 64 db 33-39 38 b6 be c4 d4 e3 5e   ..(..d.398.....^
    0080 - 60 d3 0e 43 c8 8e 8b 39-6f 76 1a bb 99 c5 4c 6d   `..C...9ov....Lm
    0090 - 2e 22 6b 00 a1 4b 67 19-ef c7 56 a5 b0 84 a0 33   ."k..Kg...V....3
    00a0 - 6b 0f 5e ed fe bb e7 1b-55 ad 2d 0e c4 0b 1b 05   k.^.....U.-.....
    00b0 - 66 9a b1 4c 2d 9d ec e8-87 d2 bc e5 af 15 95 c1   f..L-...........
    00c0 - fc 7d 87 0f 54 75 dd d5-aa e0 5e 89 71 84 be 45   .}..Tu....^.q..E
    00d0 - 61 1d 58 cb 43 7f 1b 29-c6 b5 a8 7d fe 41 9b 2a   a.X.C..)...}.A.*
    00e0 - 6a 1c cb 43 1f b7 3f 71-e0 cf 09 f6 85 af 82 ba   j..C..?q........
    00f0 - 50 9e b8 2c a8 80 bd 61-54 04 0e 02 74 8a 92 1c   P..,...aT...t...

    Start Time: 1779979538
    Timeout   : 7200 (sec)
    Verify return code: 19 (self-signed certificate in certificate chain)
    Extended master secret: no
    Max Early Data: 0
---
read R BLOCK
WebexWebApp_EnableDebug.reg
Windows Registry Editor Version 5.00
 
[HKEY_LOCAL_MACHINE\SOFTWARE\Cisco Spark Native]
"EnableEmbeddedAppDebug"=dword:00000001
WebexWebApp_DisableDebug.reg
Windows Registry Editor Version 5.00
 
[HKEY_LOCAL_MACHINE\SOFTWARE\Cisco Spark Native]
"EnableEmbeddedAppDebug"=dword:00000000
  • vendors/cisco/wxcc/calling.txt
  • Last modified: 2026/06/05 09:31
  • by gerardorourke