diff --git a/channels/chan_alsa.c b/channels/chan_alsa.c
index 5a375c5c0a..1975df0caf 100644
--- a/channels/chan_alsa.c
+++ b/channels/chan_alsa.c
@@ -62,7 +62,8 @@ static struct ast_jb_conf default_jbconf = {
 	.flags = 0,
 	.max_size = -1,
 	.resync_threshold = -1,
-	.impl = ""
+	.impl = "",
+	.target_extra = -1,
 };
 static struct ast_jb_conf global_jbconf;
 
diff --git a/channels/chan_console.c b/channels/chan_console.c
index 0d2d6360b9..935c081edf 100644
--- a/channels/chan_console.c
+++ b/channels/chan_console.c
@@ -175,7 +175,8 @@ static struct ast_jb_conf default_jbconf = {
 	.flags = 0,
 	.max_size = -1,
 	.resync_threshold = -1,
-	.impl = ""
+	.impl = "",
+	.target_extra = -1,
 };
 static struct ast_jb_conf global_jbconf;
 
diff --git a/channels/chan_dahdi.c b/channels/chan_dahdi.c
index cecbfa46bf..94a8995491 100644
--- a/channels/chan_dahdi.c
+++ b/channels/chan_dahdi.c
@@ -120,7 +120,8 @@ static struct ast_jb_conf default_jbconf =
 	.flags = 0,
 	.max_size = -1,
 	.resync_threshold = -1,
-	.impl = ""
+	.impl = "",
+	.target_extra = -1,
 };
 static struct ast_jb_conf global_jbconf;
 
diff --git a/channels/chan_gtalk.c b/channels/chan_gtalk.c
index 884438316f..0020feba67 100644
--- a/channels/chan_gtalk.c
+++ b/channels/chan_gtalk.c
@@ -78,7 +78,8 @@ static struct ast_jb_conf default_jbconf =
 	.flags = 0,
 	.max_size = -1,
 	.resync_threshold = -1,
-	.impl = ""
+	.impl = "",
+	.target_extra = -1,
 };
 static struct ast_jb_conf global_jbconf;
 
diff --git a/channels/chan_h323.c b/channels/chan_h323.c
index c44e0597f9..697b90d306 100644
--- a/channels/chan_h323.c
+++ b/channels/chan_h323.c
@@ -118,7 +118,8 @@ static struct ast_jb_conf default_jbconf =
 	.flags = 0,
 	.max_size = -1,
 	.resync_threshold = -1,
-	.impl = ""
+	.impl = "",
+	.target_extra = -1,
 };
 static struct ast_jb_conf global_jbconf;
 
diff --git a/channels/chan_jingle.c b/channels/chan_jingle.c
index b47679b0dd..ba463e9c78 100644
--- a/channels/chan_jingle.c
+++ b/channels/chan_jingle.c
@@ -77,7 +77,8 @@ static struct ast_jb_conf default_jbconf =
 	.flags = 0,
 	.max_size = -1,
 	.resync_threshold = -1,
-	.impl = ""
+	.impl = "",
+	.target_extra = -1,
 };
 static struct ast_jb_conf global_jbconf;
 
diff --git a/channels/chan_local.c b/channels/chan_local.c
index 3853444618..94893ebd0a 100644
--- a/channels/chan_local.c
+++ b/channels/chan_local.c
@@ -59,6 +59,7 @@ static struct ast_jb_conf g_jb_conf = {
 	.max_size = -1,
 	.resync_threshold = -1,
 	.impl = "",
+	.target_extra = -1,
 };
 
 static struct ast_channel *local_request(const char *type, int format, void *data, int *cause);
diff --git a/channels/chan_mgcp.c b/channels/chan_mgcp.c
index 067bc13d7f..07cf590bb9 100644
--- a/channels/chan_mgcp.c
+++ b/channels/chan_mgcp.c
@@ -92,7 +92,8 @@ static struct ast_jb_conf default_jbconf =
 	.flags = 0,
 	.max_size = -1,
 	.resync_threshold = -1,
-	.impl = ""
+	.impl = "",
+	.target_extra = -1,
 };
 static struct ast_jb_conf global_jbconf;
 
diff --git a/channels/chan_oss.c b/channels/chan_oss.c
index e6126d2643..cd87efea81 100644
--- a/channels/chan_oss.c
+++ b/channels/chan_oss.c
@@ -72,6 +72,7 @@ static struct ast_jb_conf default_jbconf =
 	.max_size = -1,
 	.resync_threshold = -1,
 	.impl = "",
+	.target_extra = -1,
 };
 static struct ast_jb_conf global_jbconf;
 
diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 6e45b882cc..a009299019 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -252,7 +252,8 @@ static struct ast_jb_conf default_jbconf =
 	.flags = 0,
 	.max_size = -1,
 	.resync_threshold = -1,
-	.impl = ""
+	.impl = "",
+	.target_extra = -1,
 };
 static struct ast_jb_conf global_jbconf;	/*!< Global jitterbuffer configuration */
 
diff --git a/channels/chan_skinny.c b/channels/chan_skinny.c
index 126c18bb74..a04a564937 100644
--- a/channels/chan_skinny.c
+++ b/channels/chan_skinny.c
@@ -151,7 +151,8 @@ static struct ast_jb_conf default_jbconf =
 	.flags = 0,
 	.max_size = -1,
 	.resync_threshold = -1,
-	.impl = ""
+	.impl = "",
+	.target_extra = -1,
 };
 static struct ast_jb_conf global_jbconf;
 
diff --git a/channels/chan_unistim.c b/channels/chan_unistim.c
index 90ed73b3cd..4480c9de18 100644
--- a/channels/chan_unistim.c
+++ b/channels/chan_unistim.c
@@ -188,10 +188,11 @@ static void dummy(char *dummy, ...)
 /*! \brief Global jitterbuffer configuration - by default, jb is disabled */
 static struct ast_jb_conf default_jbconf =
 {
-        .flags = 0,
+	.flags = 0,
 	.max_size = -1,
 	.resync_threshold = -1,
-	.impl = ""
+	.impl = "",
+	.target_extra = -1,
 };
 static struct ast_jb_conf global_jbconf;
 				
diff --git a/channels/chan_usbradio.c b/channels/chan_usbradio.c
index 26d686a8ab..0092d76830 100644
--- a/channels/chan_usbradio.c
+++ b/channels/chan_usbradio.c
@@ -131,6 +131,7 @@ static struct ast_jb_conf default_jbconf =
 	.max_size = -1,
 	.resync_threshold = -1,
 	.impl = "",
+	.target_extra = -1,
 };
 static struct ast_jb_conf global_jbconf;
 
diff --git a/channels/misdn_config.c b/channels/misdn_config.c
index a3b956888e..f51c655a97 100644
--- a/channels/misdn_config.c
+++ b/channels/misdn_config.c
@@ -57,6 +57,7 @@ static struct ast_jb_conf default_jbconf =
 	.max_size = -1,
 	.resync_threshold = -1,
 	.impl = "",
+	.target_extra = -1,
 };
 
 static struct ast_jb_conf global_jbconf;
diff --git a/configs/alsa.conf.sample b/configs/alsa.conf.sample
index f550306185..fa2ff1d9bb 100644
--- a/configs/alsa.conf.sample
+++ b/configs/alsa.conf.sample
@@ -57,6 +57,13 @@ extension=s
                               ; (with size always equals to jbmax-size) and "adaptive" (with
                               ; variable size, actually the new jb of IAX2). Defaults to fixed.
 
+; jbtargetextra = 40          ; This option only affects the jb when 'jbimpl = adaptive' is set.
+                              ; The option represents the number of milliseconds by which the new
+                              ; jitter buffer will pad its size. the default is 40, so without
+                              ; modification, the new jitter buffer will set its size to the jitter
+                              ; value plus 40 milliseconds. increasing this value may help if your
+                              ; network normally has low jitter, but occasionally has spikes.
+
 ; jblog = no                  ; Enables jitterbuffer frame logging. Defaults to "no".
 ;-----------------------------------------------------------------------------------
 
diff --git a/configs/chan_dahdi.conf.sample b/configs/chan_dahdi.conf.sample
index 9e6c34f9d8..942e0da355 100644
--- a/configs/chan_dahdi.conf.sample
+++ b/configs/chan_dahdi.conf.sample
@@ -763,6 +763,13 @@ pickupgroup=1
                               ; (with size always equals to jbmax-size) and "adaptive" (with
                               ; variable size, actually the new jb of IAX2). Defaults to fixed.
 
+; jbtargetextra = 40          ; This option only affects the jb when 'jbimpl = adaptive' is set.
+                              ; The option represents the number of milliseconds by which the new
+                              ; jitter buffer will pad its size. the default is 40, so without
+                              ; modification, the new jitter buffer will set its size to the jitter
+                              ; value plus 40 milliseconds. increasing this value may help if your
+                              ; network normally has low jitter, but occasionally has spikes.
+
 ; jblog = no                  ; Enables jitterbuffer frame logging. Defaults to "no".
 ;-----------------------------------------------------------------------------------
 ;
diff --git a/configs/console.conf.sample b/configs/console.conf.sample
index ff58605a38..7a40ed02e1 100644
--- a/configs/console.conf.sample
+++ b/configs/console.conf.sample
@@ -64,6 +64,13 @@
                               ; (with size always equals to jbmax-size) and "adaptive" (with
                               ; variable size, actually the new jb of IAX2). Defaults to fixed.
 
+; jbtargetextra = 40          ; This option only affects the jb when 'jbimpl = adaptive' is set.
+                              ; The option represents the number of milliseconds by which the new
+                              ; jitter buffer will pad its size. the default is 40, so without
+                              ; modification, the new jitter buffer will set its size to the jitter
+                              ; value plus 40 milliseconds. increasing this value may help if your
+                              ; network normally has low jitter, but occasionally has spikes.
+
 ; jblog = no                  ; Enables jitterbuffer frame logging. Defaults to "no".
 ;-----------------------------------------------------------------------------------
 
diff --git a/configs/mgcp.conf.sample b/configs/mgcp.conf.sample
index 104891e8a1..78ee42a3dc 100644
--- a/configs/mgcp.conf.sample
+++ b/configs/mgcp.conf.sample
@@ -35,6 +35,13 @@
                               ; (with size always equals to jbmax-size) and "adaptive" (with
                               ; variable size, actually the new jb of IAX2). Defaults to fixed.
 
+; jbtargetextra = 40          ; This option only affects the jb when 'jbimpl = adaptive' is set.
+                              ; The option represents the number of milliseconds by which the new
+                              ; jitter buffer will pad its size. the default is 40, so without
+                              ; modification, the new jitter buffer will set its size to the jitter
+                              ; value plus 40 milliseconds. increasing this value may help if your
+                              ; network normally has low jitter, but occasionally has spikes.
+
 ; jblog = no                  ; Enables jitterbuffer frame logging. Defaults to "no".
 ;-----------------------------------------------------------------------------------
 
diff --git a/configs/misdn.conf.sample b/configs/misdn.conf.sample
index 98fcd29c6f..deaede5cb3 100644
--- a/configs/misdn.conf.sample
+++ b/configs/misdn.conf.sample
@@ -158,6 +158,13 @@ crypt_keys=test,muh
                               ; (with size always equals to jbmaxsize) and "adaptive" (with
                               ; variable size, actually the new jb of IAX2). Defaults to fixed.
 
+; jbtargetextra = 40          ; This option only affects the jb when 'jbimpl = adaptive' is set.
+                              ; The option represents the number of milliseconds by which the new
+                              ; jitter buffer will pad its size. the default is 40, so without
+                              ; modification, the new jitter buffer will set its size to the jitter
+                              ; value plus 40 milliseconds. increasing this value may help if your
+                              ; network normally has low jitter, but occasionally has spikes.
+
 ; jblog = no                  ; Enables jitterbuffer frame logging. Defaults to "no".
 ;-----------------------------------------------------------------------------------
 
diff --git a/configs/oss.conf.sample b/configs/oss.conf.sample
index 24b0b38ee1..e748124d2f 100644
--- a/configs/oss.conf.sample
+++ b/configs/oss.conf.sample
@@ -66,6 +66,13 @@
                                   ; (with size always equals to jbmax-size) and "adaptive" (with
                                   ; variable size, actually the new jb of IAX2). Defaults to fixed.
 
+    ; jbtargetextra = 40          ; This option only affects the jb when 'jbimpl = adaptive' is set.
+                                  ; The option represents the number of milliseconds by which the new
+                                  ; jitter buffer will pad its size. the default is 40, so without
+                                  ; modification, the new jitter buffer will set its size to the jitter
+                                  ; value plus 40 milliseconds. increasing this value may help if your
+                                  ; network normally has low jitter, but occasionally has spikes.
+
     ; jblog = no                  ; Enables jitterbuffer frame logging. Defaults to "no".
     ;-----------------------------------------------------------------------------------
 
diff --git a/configs/sip.conf.sample b/configs/sip.conf.sample
index f68361424e..141b296366 100644
--- a/configs/sip.conf.sample
+++ b/configs/sip.conf.sample
@@ -726,6 +726,13 @@ srvlookup=yes                   ; Enable DNS SRV lookups on outbound calls
                               ; (with size always equals to jbmaxsize) and "adaptive" (with
                               ; variable size, actually the new jb of IAX2). Defaults to fixed.
 
+; jbtargetextra = 40          ; This option only affects the jb when 'jbimpl = adaptive' is set.
+                              ; The option represents the number of milliseconds by which the new jitter buffer
+                              ; will pad its size. the default is 40, so without modification, the new
+                              ; jitter buffer will set its size to the jitter value plus 40 milliseconds.
+                              ; increasing this value may help if your network normally has low jitter,
+                              ; but occasionally has spikes.
+
 ; jblog = no                  ; Enables jitterbuffer frame logging. Defaults to "no".
 ;-----------------------------------------------------------------------------------
 
diff --git a/configs/usbradio.conf.sample b/configs/usbradio.conf.sample
index 5ba9815ca1..6af373e6d1 100644
--- a/configs/usbradio.conf.sample
+++ b/configs/usbradio.conf.sample
@@ -48,6 +48,13 @@
                               ; (with size always equals to jbmax-size) and "adaptive" (with
                               ; variable size, actually the new jb of IAX2). Defaults to fixed.
 
+; jbtargetextra = 40          ; This option only affects the jb when 'jbimpl = adaptive' is set.
+                              ; The option represents the number of milliseconds by which the new
+                              ; jitter buffer will pad its size. the default is 40, so without
+                              ; modification, the new jitter buffer will set its size to the jitter
+                              ; value plus 40 milliseconds. increasing this value may help if your
+                              ; network normally has low jitter, but occasionally has spikes.
+
 ; jblog = no                  ; Enables jitterbuffer frame logging. Defaults to "no".
 ;-----------------------------------------------------------------------------------
 
diff --git a/include/asterisk/abstract_jb.h b/include/asterisk/abstract_jb.h
index 2a1b89fd18..a1f3cdd9d8 100644
--- a/include/asterisk/abstract_jb.h
+++ b/include/asterisk/abstract_jb.h
@@ -57,9 +57,11 @@ struct ast_jb_conf
 	/*! \brief Max size of the jitterbuffer implementation. */
 	long max_size;
 	/*! \brief Resynchronization threshold of the jitterbuffer implementation. */
- 	long resync_threshold;
+	long resync_threshold;
 	/*! \brief Name of the jitterbuffer implementation to be used. */
- 	char impl[AST_JB_IMPL_NAME_SIZE];
+	char impl[AST_JB_IMPL_NAME_SIZE];
+	/*! \brief amount of additional jitterbuffer adjustment */
+	long target_extra;
 };
 
 
@@ -69,6 +71,7 @@ struct ast_jb_conf
 #define AST_JB_CONF_FORCE "force"
 #define AST_JB_CONF_MAX_SIZE "maxsize"
 #define AST_JB_CONF_RESYNCH_THRESHOLD "resyncthreshold"
+#define AST_JB_CONF_TARGET_EXTRA "targetextra"
 #define AST_JB_CONF_IMPL "impl"
 #define AST_JB_CONF_LOG "log"
 
diff --git a/main/abstract_jb.c b/main/abstract_jb.c
index af5b61431b..8d78653ddb 100644
--- a/main/abstract_jb.c
+++ b/main/abstract_jb.c
@@ -584,6 +584,10 @@ int ast_jb_read_conf(struct ast_jb_conf *conf, const char *varname, const char *
 	} else if (!strcasecmp(name, AST_JB_CONF_IMPL)) {
 		if (!ast_strlen_zero(value))
 			snprintf(conf->impl, sizeof(conf->impl), "%s", value);
+	} else if (!strcasecmp(name, AST_JB_CONF_TARGET_EXTRA)) {
+		if (sscanf(value, "%30d", &tmp) == 1) {
+			conf->target_extra = tmp;
+		}
 	} else if (!strcasecmp(name, AST_JB_CONF_LOG)) {
 		ast_set2_flag(conf, ast_true(value), AST_JB_LOG);
 	} else {
@@ -730,6 +734,7 @@ static void *jb_create_adaptive(struct ast_jb_conf *general_config, long resynch
 		jbconf.max_jitterbuf = general_config->max_size;
 		jbconf.resync_threshold = general_config->resync_threshold;
 		jbconf.max_contig_interp = 10;
+		jbconf.target_extra = general_config->target_extra;
 		jb_setconf(adaptivejb, &jbconf);
 	}