authentication failure

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Hello!
Ater several successful SRTP-enabled calls with SRTP set to Mandatory,
asterisk starts to give the following warnings in Log:

WARNING[13714] res_srtp.c: SRTP unprotect: authentication failure
(continiously)

and client hears no sound. After i restart the client program it works
fine again for a while. Then the same warning again.

Asterisk 1.8.1.1, RealTime engine, sip peer has encrytion->yes
The client program is CSipSimple on Android

Here are some log file traces:
Peer 0010101 is calling some number that is routed to context a2billing

[2010-12-23 11:06:22] DEBUG[5941] sip/sdp_crypto.c: local_key64
3gWGFJAffj4Pn393BUPwe3/wOMx5/ndZyPtfno7L len 40
[2010-12-23 11:06:22] DEBUG[5941] sip/sdp_crypto.c: SRTP policy activated
[2010-12-23 11:06:22] DEBUG[5941] chan_sip.c: Processing media-level
(audio) SDP a=crypto:1 AES_CM_128_HMAC_SHA1_80
inline:0VyG/fnup0U9qDoTGlWvVuE5yAef5MfYU6F67oI+… OK.
[2010-12-23 11:06:22] DEBUG[5941] chan_sip.c: We’ve already processed
a crypto attribute, skipping ‘crypto:2 AES_CM_128_HMAC_SHA1_32
inline:5X/Zqep5tNdDGFhOY1//VFQ7diCCH1Y1FUKgYXLp’

[2010-12-23 11:06:22] DEBUG[5941] chan_sip.c: *** Our native formats
are 0x100 (g729)
[2010-12-23 11:06:22] DEBUG[5941] chan_sip.c: *** Joint capabilities
are 0x100 (g729)
[2010-12-23 11:06:22] DEBUG[5941] chan_sip.c: *** Our capabilities are
0x10e (gsm|ulaw|alaw|g729)
[2010-12-23 11:06:22] DEBUG[5941] chan_sip.c: *** AST_CODEC_CHOOSE
formats are 0x100 (g729)

010-12-23 11:06:22] DEBUG[5941] chan_sip.c: build_route: Contact hop:

[2010-12-23 11:06:22] DEBUG[5941] chan_sip.c: Incoming INVITE with
‘timer’ option supported and “Session-Expires” header.
[2010-12-23 11:06:22] DEBUG[5941] chan_sip.c: Session-Expires: 1800
[2010-12-23 11:06:22] DEBUG[5941] chan_sip.c: Received Min-SE: 90

[2010-12-23 11:06:22] DEBUG[5931] chan_sip.c: -REALTIME- peer built.
Name: 0010101. Peer objects: 660
[2010-12-23 11:06:22] DEBUG[5931] netsock2.c: Splitting ‘78.84.207.114’ gives…
[2010-12-23 11:06:22] DEBUG[5931] netsock2.c: …host ‘78.84.207.114’
and port ‘(null)’.
[2010-12-23 11:06:22] DEBUG[5931] chan_sip.c: Not an IPv4 nor IPv6
address, cannot get port.
[2010-12-23 11:06:22] DEBUG[5931] chan_sip.c: Not an IPv4 nor IPv6
address, cannot set port.
[2010-12-23 11:06:22] DEBUG[5931] chan_sip.c: -REALTIME- loading peer
from database to memory. Name: 0010101. Peer objects: 660
[2010-12-23 11:06:22] DEBUG[5931] chan_sip.c: Destroying SIP peer 0010101
[2010-12-23 11:06:22] DEBUG[5931] chan_sip.c: -REALTIME- peer
Destroyed. Name: 0010101. Realtime Peer objects: 659
[2010-12-23 11:06:22] DEBUG[5931] devicestate.c: Changing state for
SIP/0010101 – state 1 (Not in use)

is this normal here? peer destroyed?

[2010-12-23 11:06:22] DEBUG[5931] devicestate.c: device ‘SIP/0010101’ state ‘1’
[2010-12-23 11:06:22] WARNING[8264] res_srtp.c: SRTP unprotect:
authentication failure
[2010-12-23 11:06:22] DEBUG[5941] chan_sip.c: = Looking for  Call ID:
2WZXYS-qTPPfXylUor4tckg25TetmIVP (Checking From) –From tag
50FYKcXAUIrUwsIpR5xm9pjrSrMaDglb –To-tag as46be1cdb
[2010-12-23 11:06:22] DEBUG[5941] chan_sip.c: **** Received ACK (6) –
Command in SIP ACK
[2010-12-23 11:06:22] DEBUG[5941] chan_sip.c: Stopping retransmission
on ‘2WZXYS-qTPPfXylUor4tckg25TetmIVP’ of Response 20465: Match Found
[2010-12-23 11:06:22] WARNING[8264] res_srtp.c: SRTP unprotect:
authentication failure
[2010-12-23 11:06:22] WARNING[8264] res_srtp.c: SRTP unprotect:
authentication failure
[2010-12-23 11:06:22] WARNING[8264] res_srtp.c: SRTP unprotect:
authentication failure
[2010-12-23 11:06:22] WARNING[8264] res_srtp.c: SRTP unprotect:
authentication failure
[2010-12-23 11:06:22] WARNING[8264] res_srtp.c: SRTP unprotect:
authentication failure
[2010-12-23 11:06:22] WARNING[8264] res_srtp.c: SRTP unprotect:
authentication failure