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Phone-proxy issue at single site to only SIP trunks

I'm modifying this message because I have new information.  Phones at a specific location are having a problem with no audio when registering via phone-proxy to an ASA off-site.  This no audio problme is only occuring for calls routed to 2 SIP trunks configured in CUCM (with "Use MTP" selected).  Calls to our gateways work fine.  Phones in other locations (i.e. at home) using phone-proxy work fine to our gateways and SIP trunks.  At the site in question, I've tried 2 models of phones, moving them inside and outside the company firwall (PIX 515), etc.  I'm hoping someone at Cisco can look at this debug and see what the problem is.  When the audio fails, we see the session unlock rather than be created.  Also, under the "show phone-proxy media-session", we only see an RTP connection between the ASA and the phone when it doesn't work.  We see "SRTP" under the connection between the ASA and the phone when everything works fine.

*All IP's below have been modified

Here is an example of a call that does work:

172.29.148.62 = MTA External Address

10.10.10.49 = MTA Internal Address

70.113.118.148 = Road Runner Public IP (where phone is located)

10.10.100.4 - Transcoder IP (since phone is using g.729 and SIP trunk is g.711)

Creating new media session in SNP 172.29.148.62/18308
Setting local SRTP params in SNP 172.29.148.62/18308
SNP_SRTP::master_key and salt bc3353a2cd6190f1a469fbbd22475dc4 bc3353a2cd6190f1a469fbbd22475dc4
Setting remote_side SRTP params in SNP 172.29.148.62/18308
SNP_SRTP::master_key and salt 50846cfa2cb33287965e387320848fce 50846cfa2cb33287965e387320848fce
snp_client_sess_create: Creating client_sess 10.10.10.49/21176 70.113.118.148/18542
snp_media_sess_lock: locking media_sess 10.10.10.49/21176 1
Creating new media session in SNP 10.10.10.49/21176
Remote SRTP params for 172.29.148.62/18308 already set
Local SRTP params for 172.29.148.62/18308 already set
snp_media_sess_lock: locking media_sess 172.29.148.62/18308 2
snp_media_sess_lock: locking media_sess 172.29.148.62/18308 3
snp_media_sess_lock: locking media_sess 10.10.10.49/21176 2
snp_media_sess_lock: locking media_sess 10.10.10.49/21176 3
snp_media_sess_lock: locking media_sess 10.10.10.49/21176 4
SNP_SRTP::Remote media_session found for 172.29.148.62/18308 lcl_ip/lcl_port 10.10.10.49/21176  client_ip/client_port 70.113.118.148/0
SNP_SRTP:: lcl_media_sess b1bb5170 rmt_media_sess b1bb4c50 rmt_party_copy calloc b25021d8
SNP_SRTP::Setting rmt_party_copy's rmt_pp_ip/port 10.10.10.49/21176 for 172.29.148.62/18308
SNP_SRTP::Remote media_session found for 10.10.10.49/21176 lcl_ip/lcl_port 172.29.148.62/18308  client_ip/client_port 10.10.100.4/17286
SNP_SRTP:: lcl_media_sess b1bb4c50 rmt_media_sess b1bb5170 rmt_party_copy calloc b22d9700
SNP_SRTP::Setting client_port to sport 18542
snp_media_sess_unlock: unlocking media_sess 10.10.10.49/28568 1
snp_media_sess_unlock: unlocking media_sess 10.10.10.49/28568 0
snp_media_sess_release: releasing media_sess 10.10.10.49/28568
snp_media_sess_unlock: unlocking media_sess 172.29.148.62/18308 2
snp_media_sess_unlock: unlocking media_sess 172.29.148.62/18308 1
snp_media_sess_unlock: unlocking media_sess 10.10.10.49/21176 3
snp_media_sess_unlock: unlocking media_sess 10.10.10.49/21176 2
snp_media_sess_unlock: unlocking media_sess 172.29.148.62/18308 0
snp_media_sess_release: releasing media_sess 172.29.148.62/18308

Here is a call that doesn't work:

172.29.148.62 = MTA External Address

10.10.10.49 = MTA Internal Address

207.100.231.21 = Corporate Public IP (where phone is located)

10.10.100.4 - Transcoder IP (since phone is using g.729 and SIP trunk is g.711)

Creating new media session in SNP 172.29.148.62/24326
Setting local SRTP params in SNP 172.29.148.62/24326
SNP_SRTP::master_key and salt 7050cd741be778b97f48329886694e70 7050cd741be778b97f48329886694e70
Setting remote_side SRTP params in SNP 172.29.148.62/24326
SNP_SRTP::master_key and salt 0ed838ff944eb1e0a330b631f712f1a0 0ed838ff944eb1e0a330b631f712f1a0
snp_media_sess_unlock: unlocking media_sess 172.29.148.62/24326 0
snp_media_sess_release: releasing media_sess 172.29.148.62/24326
snp_client_sess_create: Creating client_sess 172.29.148.62/22956 10.10.100.12/17728
snp_media_sess_lock: locking media_sess 172.29.148.62/22956 1
Creating new media session in SNP 172.29.148.62/22956
Setting remote_side SRTP params in SNP 172.29.148.62/22956
SNP_SRTP::master_key and salt 9619f3b118133cf3e8b6c306f197614f 9619f3b118133cf3e8b6c306f197614f
snp_media_sess_unlock: unlocking media_sess 172.29.148.62/22956 0
snp_media_sess_release: releasing media_sess 172.29.148.62/22956
snp_client_sess_create: Creating client_sess 172.29.148.62/28146 10.10.100.4/17086
snp_media_sess_lock: locking media_sess 172.29.148.62/28146 1
Creating new media session in SNP 172.29.148.62/28146
Setting remote_side SRTP params in SNP 172.29.148.62/28146
SNP_SRTP::master_key and salt 9619f3b118133cf3e8b6c306f197614f 9619f3b118133cf3e8b6c306f197614f
snp_client_sess_create: Creating client_sess 10.10.10.49/16834 207.100.231.2/17280
snp_media_sess_lock: locking media_sess 10.10.10.49/16834 1
Creating new media session in SNP 10.10.10.49/16834
Remote SRTP params for 172.29.148.62/28146 already set
snp_media_sess_lock: locking media_sess 172.29.148.62/28146 2
snp_media_sess_lock: locking media_sess 172.29.148.62/28146 3
snp_media_sess_lock: locking media_sess 10.10.10.49/16834 2
snp_media_sess_lock: locking media_sess 10.10.10.49/16834 3
snp_media_sess_lock: locking media_sess 10.10.10.49/16834 4
SNP_SRTP::Remote media_session found for 172.29.148.62/28146 lcl_ip/lcl_port 10.10.10.49/16834  client_ip/client_port 207.100.231.2/0
SNP_SRTP:: lcl_media_sess b22d90b0 rmt_media_sess b24faeb8 rmt_party_copy calloc b24f5fb8
SNP_SRTP::Setting rmt_party_copy's rmt_pp_ip/port 10.10.10.49/16834 for 172.29.148.62/28146
snp_media_sess_unlock: unlocking media_sess 172.29.148.62/28146 2
snp_media_sess_unlock: unlocking media_sess 172.29.148.62/28146 1
snp_media_sess_unlock: unlocking media_sess 10.10.10.49/16834 3
snp_media_sess_unlock: unlocking media_sess 10.10.10.49/16834 2
snp_media_sess_unlock: unlocking media_sess 172.29.148.62/28146 0
snp_media_sess_release: releasing media_sess 172.29.148.62/28146
snp_media_sess_unlock: unlocking media_sess 10.10.10.49/24390 0
snp_media_sess_release: releasing media_sess 10.10.10.49/24390

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