pjsip销毁导致应用崩溃，场景是正在打电话中网络类型切换，调用pjsua_destory2()销毁pjsip库 再重新注册 请问如何能避免这个问题

附上log

1. --end msg--
2. 08:15:19.450 tsx0xb4f47444 .Incoming Response msg 183/INVITE/cseq=12001 (rdata0xb4f4162c) in state Proceeding
3. 08:15:19.450 tsx0xb4f47444 ..State changed from Proceeding to Proceeding, event=RX_MSG
4. 08:15:19.450 dlg0x7f5bccdc ...Received Response msg 183/INVITE/cseq=12001 (rdata0xb4f4162c)
5. 08:15:19.450 dlg0x7f5bccdc ...Transaction tsx0xb4f47444 state changed to Proceeding
6. 08:15:19.664 inv0x7f5bccdc ....Got SDP answer in Response msg 183/INVITE/cseq=12001 (rdata0xb4f4162c)
7. 08:15:19.669 inv0x7f5bccdc ....SDP negotiation done: Success
8. 08:15:19.669 pjsua_call.c .....Call 0: remote NAT type is 0 (Unknown)
9. 08:15:19.670 pjsua_media.c .....Call 0: updating media..
10. 08:15:19.682 pjsua_media.c .......Media stream call00:0 is destroyed
11. 08:15:19.683 pjsua_aud.c ......Audio channel update..
12. 08:15:19.684 strm0xb4f4984c .......VAD temporarily disabled
13. 08:15:19.685 rtp.c .......pjmedia_rtp_session_init: ses=0xb4f4badc, default_pt=0, ssrc=0x7f2d8dc0
14. 08:15:19.685 rtp.c .......pjmedia_rtp_session_init: ses=0xb4f4c164, default_pt=0, ssrc=0x7f2d8dc0
15. 08:15:19.688 stream.c .......Stream strm0xb4f4984c created
16. 08:15:19.688 strm0xb4f4984c .......Encoder stream started
17. 08:15:19.688 strm0xb4f4984c .......Decoder stream started
18. 08:15:19.689 resample.c .......resample created: high qualiy, large filter, in/out rate=8000/16000
19. 08:15:19.689 resample.c .......resample created: high qualiy, large filter, in/out rate=16000/8000
20. 08:15:19.689 pjsua_media.c ......Audio updated, stream #0: PCMU (sendrecv)
21. 08:15:19.696 pjsua_aud.c .....Conf connect: 1 --> 0
22. 08:15:19.696 conference.c ......Port 1 (sip:8001@login.yunzongji.cn:5070) transmitting to port 0 (Master/sound)
23. 08:15:19.696 pjsua_aud.c .....Conf connect: 0 --> 1
24. 08:15:19.696 conference.c ......Port 0 (Master/sound) transmitting to port 1 (sip:8001@login.yunzongji.cn:5070)
25. 08:15:19.861 Master/sound !Underflow, buf_cnt=0, will generate 1 frame
26. 08:15:19.864 strm0xb4f4984c Jitter buffer is bufferring (prefetch=0)
27. 08:15:19.873 strm0xb4f4984c Start talksprut..
28. 08:15:19.881 Master/sound Underflow, buf_cnt=0, will generate 1 frame
29. 08:15:20.145 strm0xb4f4984c !RTP status: badpt=0, badssrc=0, dup=0, outorder=0, probation=-1, restart=0
30. 08:15:20.166 strm0xb4f4984c !Jitter buffer starts returning normal frames (after 15 empty/lost)
31. 08:15:20.325 Master/sound Underflow, buf_cnt=0, will generate 1 frame
32. 08:15:20.508 strm0xb4f4984c VAD re-enabled
33. 08:15:20.508 strm0xb4f4984c Starting silence
34. 08:15:20.728 strm0xb4f4984c Frame lost, recovered!
35. 08:15:20.728 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
36. 08:15:20.909 strm0xb4f4984c Frame lost, recovered!
37. 08:15:20.929 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
38. 08:15:21.109 strm0xb4f4984c Frame lost, recovered!
39. 08:15:21.109 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
40. 08:15:21.250 strm0xb4f4984c Frame lost, recovered!
41. 08:15:21.270 strm0xb4f4984c Jitter buffer starts returning normal frames (after 2 empty/lost)
42. 08:15:21.290 strm0xb4f4984c Frame lost, recovered!
43. 08:15:21.310 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
44. 08:15:21.491 strm0xb4f4984c Frame lost, recovered!
45. 08:15:21.491 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
46. 08:15:21.671 strm0xb4f4984c Frame lost, recovered!
47. 08:15:21.691 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
48. 08:15:21.874 strm0xb4f4984c Frame lost, recovered!
49. 08:15:21.874 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
50. 08:15:22.059 strm0xb4f4984c Frame lost, recovered!
51. 08:15:22.079 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
52. 08:15:22.259 strm0xb4f4984c Frame lost, recovered!
53. 08:15:22.259 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
54. 08:15:22.439 strm0xb4f4984c Frame lost, recovered!
55. 08:15:22.459 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
56. 08:15:22.639 strm0xb4f4984c Frame lost, recovered!
57. 08:15:22.639 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
58. 08:15:22.819 strm0xb4f4984c Frame lost, recovered!
59. 08:15:22.839 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
60. 08:15:22.888 pjsua_acc.c !Sending 2 bytes keep-alive packet for acc 0 to 121.40.48.253:5070
61. 08:15:22.888 tdta0xb4f4e7b4 Destroying txdata raw
62. 08:15:23.019 strm0xb4f4984c !Frame lost, recovered!
63. 08:15:23.019 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
64. 08:15:23.199 strm0xb4f4984c Frame lost, recovered!
65. 08:15:23.219 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
66. 08:15:23.399 strm0xb4f4984c Frame lost, recovered!
67. 08:15:23.399 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
68. 08:15:23.579 strm0xb4f4984c Frame lost, recovered!
69. 08:15:23.599 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
70. 08:15:23.779 strm0xb4f4984c Frame lost, recovered!
71. 08:15:23.779 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
72. 08:15:24.001 strm0xb4f4984c Frame lost, recovered!
73. 08:15:24.001 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
74. 08:15:24.243 strm0xb4f4984c Frame lost, recovered!
75. 08:15:24.263 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
76. 08:15:24.505 silencedet.c Re-adjust threshold (in silence)to 0
77. 08:15:24.564 strm0xb4f4984c Frame lost, recovered!
78. 08:15:24.564 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
79. 08:15:24.846 strm0xb4f4984c Frame lost, recovered!
80. 08:15:24.867 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
81. 08:15:25.209 strm0xb4f4984c Frame lost, recovered!
82. 08:15:25.209 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
83. 08:15:25.530 strm0xb4f4984c Frame lost, recovered!
84. 08:15:25.550 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
85. 08:15:25.921 Master/sound !479 samples reduced, buf_cnt=801
86. 08:15:25.921 Master/sound Buffer size adjusted from 1280 to 801 (eff_cnt=910)
87. 08:15:25.989 strm0xb4f4984c !Frame lost, recovered!
88. 08:15:25.989 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
89. 08:15:26.409 strm0xb4f4984c Frame lost, recovered!
90. 08:15:26.409 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
91. 08:15:26.809 strm0xb4f4984c Frame lost, recovered!
92. 08:15:26.809 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
93. 08:15:27.309 strm0xb4f4984c Frame lost, recovered!
94. 08:15:27.329 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
95. 08:15:28.070 strm0xb4f4984c Frame lost, recovered!
96. 08:15:28.070 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
97. 08:15:28.550 silencedet.c Re-adjust threshold (in silence)to 0
98. 08:15:28.590 strm0xb4f4984c Frame lost, recovered!
99. 08:15:28.590 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
100. 08:15:29.270 strm0xb4f4984c Frame lost, recovered!
101. 08:15:29.270 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
102. 08:15:29.921 Master/sound !479 samples reduced, buf_cnt=642
103. 08:15:29.921 Master/sound Buffer size adjusted from 1121 to 642 (eff_cnt=711)
104. 08:15:30.297 strm0xb4f4984c !Frame lost, recovered!
105. 08:15:30.317 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
106. 08:15:32.572 silencedet.c Re-adjust threshold (in silence)to 0
107. 08:15:32.851 strm0xb4f4984c Frame lost, recovered!
108. 08:15:32.871 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
109. 08:15:33.296 strm0xb4f4984c Jitter buffer empty (prefetch=0), plc invoked
110. 08:15:33.581 Master/sound !479 samples reduced, buf_cnt=803
111. 08:15:33.581 Master/sound Buffer size adjusted from 1282 to 803 (eff_cnt=693)
112. 08:15:34.336 strm0xb4f4984c !Error sending RTCP: Invalid argument
113. 08:15:35.080 Master/sound !479 samples reduced, buf_cnt=644
114. 08:15:35.081 Master/sound Buffer size adjusted from 1123 to 644 (eff_cnt=679)
115. 08:15:35.363 strm0xb4f4984c !Error sending RTCP: Invalid argument
116. 08:15:36.382 strm0xb4f4984c Error sending RTCP: Invalid argument
117. 08:15:36.604 silencedet.c Re-adjust threshold (in silence)to 0
118. 08:15:37.405 strm0xb4f4984c Error sending RTCP: Invalid argument
119. 08:15:37.889 pjsua_acc.c !Sending 2 bytes keep-alive packet for acc 0 to 121.40.48.253:5070
120. 08:15:37.889 tdta0xb4f4ea14 Destroying txdata raw
121. 08:15:37.889 pjsua_acc.c Error sending keep-alive packet: Invalid argument [status=120022]
122. 08:15:38.424 strm0xb4f4984c !Error sending RTCP: Invalid argument
123. 08:15:39.448 strm0xb4f4984c Error sending RTCP: Invalid argument
124. 08:15:40.475 strm0xb4f4984c Error sending RTCP: Invalid argument
125. 08:15:40.614 silencedet.c Re-adjust threshold (in silence)to 0
126. 08:15:41.498 strm0xb4f4984c Error sending RTCP: Invalid argument
127. 08:15:42.100 Master/sound !479 samples reduced, buf_cnt=485
128. 08:15:42.100 Master/sound Buffer size adjusted from 964 to 485 (eff_cnt=466)
129. 08:15:42.523 strm0xb4f4984c !Error sending RTCP: Invalid argument
130. 08:15:43.143 strm0xb4f4984c Jitter buffer starts returning normal frames (after 490 empty/lost)
131. 08:15:43.720 Master/sound !479 samples reduced, buf_cnt=326
132. 08:15:43.720 Master/sound Buffer size adjusted from 805 to 326 (eff_cnt=466)
133. 08:15:44.465 strm0xb4f4984c !Frame lost, recovered!
134. 08:15:44.465 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
135. 08:15:44.645 silencedet.c Re-adjust threshold (in silence)to 0
136. 08:15:45.150 strm0xb4f4984c Frame lost, recovered!
137. 08:15:45.150 strm0xb4f4984c Jitter buffer starts returning normal frames (after 1 empty/lost)
138. 08:15:45.440 Master/sound !325 samples reduced, buf_cnt=1921
139. 08:15:45.470 Master/sound 320 samples reduced, buf_cnt=1921
140. 08:15:45.480 Master/sound 320 samples reduced, buf_cnt=1921
141. 08:15:45.501 Master/sound 320 samples reduced, buf_cnt=1921
142. 08:15:45.520 Master/sound 320 samples reduced, buf_cnt=1921