Zoiper SIP Message Error

Sending to 96.234.144.59:5060 (NAT)
Receiving message!
Found peer 'sip-201' for 'sip-201' from 96.234.144.59:5060
Looking for 201 in sip-phones (domain sip.ungulate.net)

<--- Transmitting (NAT) to 96.234.144.59:5060 --->
SIP/2.0 202 Accepted
Via: SIP/2.0/UDP 66.87.82.142:8219;branch=z9hG4bK-d8754z-649c5ff5e7558a8d-1---d8754z-;received=96.234.144.59;rport=5060
From: <sip:sip-201@sip.ungulate.net;transport=UDP>;tag=e26e9404
To: <sip:201@sip.ungulate.net;transport=UDP>;tag=as41f60da0
Call-ID: NGEzM2NmOWVhNzE1NTVlNjY2NWU4NGIzMDc5NDZhNDE.
CSeq: 2 MESSAGE
Server: Asterisk PBX SVN-trunk-r408859
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH
Supported: replaces, timer
Content-Length: 0


<------------>
Scheduling destruction of SIP dialog 'NGEzM2NmOWVhNzE1NTVlNjY2NWU4NGIzMDc5NDZhNDE.' in 6400 ms (Method: MESSAGE)
[Feb 26 18:49:24] NOTICE[22895][C-00000000]: chan_sip.c:29525 sip_request_call: Asked to get a channel of unsupported format (nothing) while capability is (gsm|ulaw|alaw|h263|testlaw)
[Feb 26 18:49:24] WARNING[22895][C-00000000]: app_dial.c:2435 dial_exec_full: Unable to create channel of type 'SIP' (cause 58 - Bearer capability not available)
Really destroying SIP dialog 'MjZjOWZhN2QwMzUyOTc5OTdkMzU1NjAzYmM4ZDM1YTY.' Method: REGISTER

<--- SIP read from UDP:24.35.110.51:5060 --->

<------------->
Really destroying SIP dialog 'NGEzM2NmOWVhNzE1NTVlNjY2NWU4NGIzMDc5NDZhNDE.' Method: MESSAGE