Deprecated function: preg_replace()

Thanks in advance for the support.

Recently i moved my php 5.3 server to 5.6 php server.
Seems no more changes on drupal site.

My site made voip plivo calls using web sdk, and custom call scripts.
All was ok, .. but after this change, i'm unable to make calls using web sdk, and voip software.

On 5.3 server it works, but no on php 5.6 server.

I'm tracking some events by watchdog commands. And getting warnings like this:

Deprecated function: preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead en _voipscript_expand_variables() (línea 1255 de /var/ftp/virtual/web/sites/all/modules/contrib/voipdrupal/modules/voipcall/voipscript.inc)

Perhaps someone was fighting with a similar problem....
Any help is appreciated!