C-163

Ad Hoc Conference Call Between User Agents
Figure C-52. User Agent to User Agent to User Agent: Ad Hoc Conference Call: Disconnect Last Party — Diagram 4

VOCAL User Agent UA Marshal Redirect Server VOCAL User Agent VOCAL User Agent

48. 100
49. INVITE
50. 100
51. INVITE
52. 302
53. ACK
54. TRANSFER
55. INVITE
56. 100
57. 200
58. 200
59. 200
60. ACK
61. BYE
62. ACK
63. BYE