diff --git a/debian/patches/series b/debian/patches/series
index d517bc6a..f9d905d3 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -29,3 +29,4 @@ fix-build-with-newer-openssl.patch
 sipwise/0020-TT-9521-fix-200OK-without-SPD.patch
 sipwise/usage-reporting.patch
 sipwise/session_timers
+sipwise/introduce_forcesdp_from_pbx.patch
diff --git a/debian/patches/sipwise/introduce_forcesdp_from_pbx.patch b/debian/patches/sipwise/introduce_forcesdp_from_pbx.patch
new file mode 100644
index 00000000..88aa4d63
--- /dev/null
+++ b/debian/patches/sipwise/introduce_forcesdp_from_pbx.patch
@@ -0,0 +1,91 @@
+--- a/core/AmOfferAnswer.cpp
++++ b/core/AmOfferAnswer.cpp
+@@ -53,7 +53,8 @@ AmOfferAnswer::AmOfferAnswer(AmSipDialog
+     cseq(0),
+     sdp_remote(),
+     sdp_local(),
+-    dlg(dlg)
++    dlg(dlg),
++    force_sdp(true)
+ {
+   
+ }
+@@ -322,7 +323,7 @@ int AmOfferAnswer::onRequestOut(AmSipReq
+ 			   sdp_buf.length());
+       has_sdp = true;
+     }
+-    else {
++    else if(force_sdp) {
+       return -1;
+     }
+   } else if (sdp_body && has_sdp) {
+@@ -395,7 +396,7 @@ int AmOfferAnswer::onReplyOut(AmSipReply
+       else if (reply.code == 200 && reply.cseq_method == SIP_METH_INVITE && state == OA_Completed) {
+         // just ignore if no SDP is generated (required for B2B)
+       }
+-      else return -1;
++      else if(force_sdp) return -1;
+     }
+     else {
+       if(!sdp_body){
+--- a/apps/sbc/CallLeg.cpp
++++ b/apps/sbc/CallLeg.cpp
+@@ -197,7 +197,10 @@ CallLeg::CallLeg(const CallLeg* caller,
+   set_sip_relay_only(false); // will be changed later on (for now we have no peer so we can't relay)
+ 
+   // enable OA for the purpose of hold request detection
+-  if (dlg) dlg->setOAEnabled(true);
++  if (dlg) {
++    dlg->setOAEnabled(true);
++    dlg->setOAForceSDP(false);
++  }
+   else WARN("can't enable OA!\n");
+ 
+   // code below taken from createCalleeSession
+@@ -259,7 +262,10 @@ CallLeg::CallLeg(AmSipDialog* p_dlg, AmS
+   set_sip_relay_only(false);
+ 
+   // enable OA for the purpose of hold request detection
+-  if (dlg) dlg->setOAEnabled(true);
++  if (dlg) {
++    dlg->setOAEnabled(true);
++    dlg->setOAForceSDP(false);
++  }
+   else WARN("can't enable OA!\n");
+ }
+     
+--- a/core/AmOfferAnswer.h
++++ b/core/AmOfferAnswer.h
+@@ -53,6 +53,9 @@ private:
+ 
+   AmSipDialog* dlg;
+ 
++  /** Should SDP generation be forced when not required by standards? */
++  bool force_sdp;
++
+   /** State maintenance */
+   void saveState();
+   int  checkStateChange();
+@@ -75,6 +78,9 @@ public:
+   void clear();
+   void clearTransitionalState();
+ 
++  void setForceSDP(bool force) { force_sdp = force; }
++  bool getForceSDP() const { return force_sdp; }
++
+   /** Event handlers */
+   int onRequestIn(const AmSipRequest& req);
+   int onReplyIn(const AmSipReply& reply);
+--- a/core/AmSipDialog.h
++++ b/core/AmSipDialog.h
+@@ -95,6 +95,10 @@ protected:
+   AmOfferAnswer::OAState getOAState();
+   void setOAState(AmOfferAnswer::OAState n_st);
+   void setOAEnabled(bool oa_enabled);
++
++  void setOAForceSDP(bool force) { oa.setForceSDP(force); }
++  bool getOAForceSDP() const { return oa.getForceSDP(); }
++
+   const AmSdp& getLocalSdp() { return oa.getLocalSdp(); }
+   const AmSdp& getRemoteSdp() { return oa.getRemoteSdp(); }
+