code: public void proxyTo(final List<? extends URI> uris) {
  		for (URI uri : uris)
  		{
  			if(uri == null) {
  				throw new NullPointerException("URI can't be null");
  			}
  			if(!JainSipUtils.checkScheme(uri.toString())) {
  				throw new IllegalArgumentException("Scheme " + uri.getScheme() + " is not supported");
  			}
  			final ProxyBranchImpl branch = new ProxyBranchImpl((URI) uri, this);
  			branch.setRecordRoute(recordRoutingEnabled);
  			branch.setRecurse(recurse);
  			this.proxyBranches.put(uri, branch);
  		}
  		startProxy();
  	}
docs: /* (non-Javadoc)
  @see javax.servlet.sip.Proxy#proxyTo(java.util.List)