It seems that the current head has actually started producing this "rtpmap: 96 /0", when my client devices do not include it in the sdp.  This causes problems when I am trying to upgrade one switch at a time in my production environment.  I assume (will test here shortly) that if all switches are on the newer version, this wouldn't be an issue as the indicated patch should handle it.  

I would really like to be able to upgrade my boxes individually, but if an upgraded box add's this to the SDP, my non-upgraded boxes will kill the call.

The following is an example SDP trace from my latest head (10.01.2013) showing the SDP from the client device is normal, and then what is sent to the other freeswitch (my currently non upgraded one) includes this problem causing rtpmap.  I should note that this seems to only be the case when I activate zrtp on the clients, which causes my dial plan to set proxy_media=true.  

I haven't opened a bug in jira, I wanted to confirm if this rtpmap is in fact a bug.  If there is a good reason it is there now and isn't in my older freeswitch versions, then I may have to attempt to upgrade all at one time.

recv 1072 bytes from tls/[1.1.1.1]:50272 at 13:42:16.509540:
   ------------------------------------------------------------------------
   SIP/2.0 200 OK
   Via: SIP/2.0/TLS 2.2.2.2;branch=z9hG4bK5N858D7BX46je
   Contact: <sip:15715550001@192.168.10.136:60068;transport=tls>
   From: "Test 1" <sip:17035550001@securevoice>;tag=jSmQZ67etF8pa
   Call-ID: 6fe45089-a6d4-1231-2aac-005056ac002a
   CSeq: 50067799 INVITE
   To: <sip:15715550001@192.168.10.136:60068;rinstance=A5E7AF45;transport=tls>;tag=8508A76BFA383C2109766C45F68BCEFB
   Allow: OPTIONS, INVITE, ACK, REFER, CANCEL, BYE, NOTIFY, MESSAGE
   Supported: replaces, path
   Content-Type: application/sdp
   Content-Length: 534

   v=0
   o=- 98627 19401 IN IP4 192.168.10.136
   s=menduco
   c=IN IP4 192.168.10.136
   t=0 0
   m=audio 58620 RTP/SAVP 9 101
   a=rtpmap:101 telephone-event/8000
   a=crypto:1 AES_CM_128_HMAC_SHA1_32 inline:Df3mAFtpRclAzm98vfNWAoWqi6WaA3hfWs0e7CSi
   a=ptime:30
   a=fmtp:101 0-15
   a=zrtp-hash:1.10 99B821F2DBB96DFDC234440977DC3956441DEC6CDAE690B1B06C740F6EBC29B0
   a=sendrecv
   m=audio 0 RTP/AVP 9 0 101
   a=rtpmap:101 TELEPHONE-EVENT/8000
   a=ptime:30
   a=fmtp:101 0-15
   a=zrtp-hash:1.10 18489BD8B5526F4C92AB6EB2A04022C25E8CB5D7E58D4E633FC4545783447F8C
   ------------------------------------------------------------------------
send 472 bytes to tls/[1.1.1.1]:50272 at 13:42:16.510594:
   ------------------------------------------------------------------------
   ACK sip:15715550001@192.168.10.136:60068;transport=tls SIP/2.0
   Via: SIP/2.0/TLS 2.2.2.2;branch=z9hG4bK6y1ya9QFtDX5S
   Max-Forwards: 70
   From: "Test 1" <sip:17035550001@securevoice>;tag=jSmQZ67etF8pa
   To: <sip:15715550001@192.168.10.136:60068;rinstance=A5E7AF45;transport=tls>;tag=8508A76BFA383C2109766C45F68BCEFB
   Call-ID: 6fe45089-a6d4-1231-2aac-005056ac002a
   CSeq: 50067799 ACK
   Contact: <sip:mod_sofia@2.2.2.2:5061;transport=tls>
   Content-Length: 0
------------------------------------------------------------------------
send 1516 bytes to tls/[10.110.11.31]:47793 at 13:42:16.516187:
   ------------------------------------------------------------------------
   SIP/2.0 200 OK
   Via: SIP/2.0/TLS 10.110.11.31:5071;branch=z9hG4bKD97QXp3XZgX4a;rport=47793
   From: "Test 1" <sip:17035550001@10.110.11.31>;tag=DU0S42e40FNpg
   To: <sip:15715550001@dcprotopop1.private.sec:5071;transport=tls>;tag=tcXjHQ6gme91S
   Call-ID: 6fd5bd89-a6d4-1231-8291-005056ac002c
   CSeq: 50067799 INVITE
   Contact: <sip:15715550001@10.110.11.32:5071;transport=tls>
   User-Agent: FreeSWITCH-mod_sofia/1.5.6b+git~20131001T160636Z~6d2280df08
   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
   Supported: timer, precondition, path, replaces
   Allow-Events: talk, hold, conference, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer
   Content-Type: application/sdp
   Content-Disposition: session
   Content-Length: 408
   X-FS-Display-Name: Outbound Call
   X-FS-Display-Number: sip:15715550001@dcprotopop1.private.sec
   X-FS-Support: update_display,send_info
   Remote-Party-ID: "Outbound Call" <sip:15715550001@dcprotopop1.private.sec>;party=calling;privacy=off;screen=no

   v=0
   o=FreeSWITCH 1167543025 1167543026 IN IP4 10.110.11.32
   s=FreeSWITCH
   c=IN IP4 10.110.11.32
   t=0 0
   m=audio 27868 RTP/SAVP 9 101
   a=rtpmap:101 telephone-event/8000
   a=fmtp:101 0-15
   a=crypto:1 AES_CM_128_HMAC_SHA1_32 inline:Df3mAFtpRclAzm98vfNWAoWqi6WaA3hfWs0e7CSi
   a=ptime:30
   a=zrtp-hash:1.10 99B821F2DBB96DFDC234440977DC3956441DEC6CDAE690B1B06C740F6EBC29B0
   m=audio 0 RTP/AVP 9 0 96
   a=rtpmap:96 /0