“SIP/2.0 488 Pas acceptable ici” erreur

Je suis nouveau sur MjSip et j'utilise MjUa pour la création d'un client. Je veux me connecter à un serveur asterisk. il soutien G. 711, mais je ne peux pas config de mon appli.
J'utilise cette config:

 media=audio 4000 rtp/avp {audio 0 PCMU 8000 160, audio 8 PCMA 8000 160}

mais j'ai toujours 488 erreur
s'il vous plaît aider moi. comment le changement "MjUa" fichier de config?

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voici tous les messages de log:

INVITE sip:[email protected]:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.0.57:5060;rport;branch=z9hG4bK2bfdff77
Max-Forwards: 70
To: "Alice" <sip:[email protected]:5060>
From: "aziz" <sip:[email protected]>;tag=350164683297
Call-ID: [email protected]
CSeq: 1 INVITE
Contact: <sip:[email protected]>
Expires: 3600
User-Agent: mjsip 1.7
Content-Length: 141
Content-Type: application/sdp

v=0
o=157 0 0 IN IP4 192.168.0.57
s=-
c=IN IP4 192.168.0.57
t=0 0
m=audio 4000 rtp/avp 0 8
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
-----End-of-message-----

1365314026097: 10:23:46.097 Sun 07 Apr 2013, 192.168.0.254:5060/udp (519 bytes) received
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 192.168.0.57:5060;branch=z9hG4bK2bfdff77;received=192.168.0.57;rport=5060
From: "aziz" <sip:[email protected]>;tag=350164683297
To: "Alice" <sip:[email protected]:5060>;tag=as3f160681
Call-ID: [email protected]
CSeq: 1 INVITE
Server: FPBX-2.8.1(1.8.11.0)
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH
Supported: replaces, timer
WWW-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="6e640e9a"
Content-Length: 0

-----End-of-message-----

1365314026107: 10:23:46.107 Sun 07 Apr 2013, 192.168.0.254:5060/udp (326 bytes) sent
ACK sip:[email protected]:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.0.57:5060;rport;branch=z9hG4bK2bfdff77
Max-Forwards: 70
To: "Alice" <sip:[email protected]:5060>;tag=as3f160681
From: "aziz" <sip:[email protected]>;tag=350164683297
Call-ID: [email protected]
CSeq: 1 ACK
User-Agent: mjsip 1.7
Content-Length: 0

-----End-of-message-----

1365314026151: 10:23:46.151 Sun 07 Apr 2013, 192.168.0.254:5060/udp (706 bytes) sent
INVITE sip:[email protected]:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.0.57:5060;rport;branch=z9hG4bK644461b7
Max-Forwards: 70
To: "Alice" <sip:[email protected]:5060>
From: "aziz" <sip:[email protected]>;tag=350164683297
Call-ID: [email protected]
CSeq: 2 INVITE
Contact: <sip:[email protected]>
Expires: 3600
User-Agent: mjsip 1.7
Authorization: Digest username="157", realm="asterisk", nonce="6e640e9a", uri="sip:[email protected]:5060", algorithm=MD5, response="84ff5e12b8325a153e09ac2e316f5b1f"
Content-Length: 141
Content-Type: application/sdp

v=0
o=157 0 0 IN IP4 192.168.0.57
s=-
c=IN IP4 192.168.0.57
t=0 0
m=audio 4000 rtp/avp 0 8
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
-----End-of-message-----

1365314026152: 10:23:46.152 Sun 07 Apr 2013, 192.168.0.254:5060/udp (450 bytes) received
SIP/2.0 488 Not acceptable here
Via: SIP/2.0/UDP 192.168.0.57:5060;branch=z9hG4bK644461b7;received=192.168.0.57;rport=5060
From: "aziz" <sip:[email protected]>;tag=350164683297
To: "Alice" <sip:[email protected]:5060>;tag=as3f160681
Call-ID: [email protected]
CSeq: 2 INVITE
Server: FPBX-2.8.1(1.8.11.0)
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH
Supported: replaces, timer
Content-Length: 0

-----End-of-message-----

1365314026155: 10:23:46.155 Sun 07 Apr 2013, 192.168.0.254:5060/udp (326 bytes) sent
ACK sip:[email protected]:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.0.57:5060;rport;branch=z9hG4bK644461b7
Max-Forwards: 70
To: "Alice" <sip:[email protected]:5060>;tag=as3f160681
From: "aziz" <sip:[email protected]>;tag=350164683297
Call-ID: [email protected]
CSeq: 2 ACK
User-Agent: mjsip 1.7
Content-Length: 0

-----End-of-message-----